Council directive 92/23/EEC (repealed)Show full title

ANNEX II U.K. REQUIREMENTS FOR TYRES

1. DEFINITIONS U.K.

2. For the purposes of this Directive: U.K.

2.1. ‘type of tyre’ means a category of tyres which do not differ in such essential respects as: U.K.

2.1.1. manufacturer's name or trade mark; U.K.

2.1.2. tyre-size designation; U.K.

2.1.3. category of use: U.K.

— normal

:

normal road-use tyre,

— special

:

special-use tyre, e.g. tyre for mixed use (both on and off the road) and at restricted speed,

• snow tyre,

• temporary-use spare tyre;

2.1.4. structure (diagonal (bias-ply), bias-belted, radial-ply); U.K.

2.1.5. speed category; U.K.

2.1.6. load capacity index; U.K.

2.1.7. tyre cross-section; U.K.

2.2. ‘snow tyre’ means a tyre the tread pattern and structure of which are primarily designed to ensure in mud and fresh or melting snow a performance better than that of a normal tyre. The tread pattern of a snow tyre generally consists of groove (rib) and/or solid-block elements more widely spaced than on a normal tyre; U.K.

2.3. ‘structure’ of a tyre means the technical characteristics of the tyre's carcass. The following structures are distinguished in particular: U.K.

2.3.1. ‘diagonal’ or ‘bias-ply’ describes a tyre structure in which the ply cords extend to the bead and are laid at alternate angles of substantially less than 90^o to the centreline of the tread; U.K.

2.3.2. ‘bias-belted’ describes a tyre structure of diagonal (bias-ply) type in which the carcass is restricted by a belt comprising two or more layers of substantially inextensible cord material laid at alternate angles close to those of the carcass; U.K.

2.3.3. ‘radial’ describes a tyre structure in which the ply cords extend to the beads and are laid substantially at 90^o to the centreline of the tread, the carcass being stabilized by an essentially inextensible circumferential belt; U.K.

2.3.4. ‘reinforce’ describes a tyre structure in which the carcass is more resistant than that of the corresponding standard tyre; U.K.

2.3.5. ‘temporary-use spare tyre’ means a tyre different from a tyre intended to be fitted to any vehicle for normal driving conditions; but intended only for temporary use under restricted driving conditions; U.K.

2.3.6. ‘T-type temporary-use spare tyre’ means a type of temporary-use spare tyre designed for use at inflation pressure higher than those established for standard and reinforced tyres; U.K.

2.4. ‘bead’ means the part of a tyre which is of such shape and structure as to fit the rim and hold the tyre on it(1); U.K.

2.5. ‘cord’ means the strands forming the fabric of the plies in the tyre(1); U.K.

2.6. ‘ply’ means a layer of rubber-coated parallel cords(1); U.K.

2.7. ‘carcass’ means that part of a tyre other than the tread and the rubber sidewalls which, when inflated, bears the load(1); U.K.

2.8. ‘tread’ means that part of a tyre which comes into contact with the ground(2); U.K.

2.9. ‘sidewall’ means the part of the tyre, excluding the tread, which is visible when the tyre, fitted to a rim, is viewed from the side(2); U.K.

2.10. ‘lower sidewall’ means the area below the line of maximum section width of the tyre, which is visible when the tyre, fitted to a rim, is viewed from the side(2); U.K.

2.11. ‘tread groove’ means the space between the adjacent ribs or blocks in the tread pattern(2); U.K.

2.12. ‘section width’ means the linear distance between the outsides of the sidewalls of an inflated tyre, excluding elevations due to labelling (marking), decoration or protective bands or ribs(2); U.K.

2.13. ‘overall width’ means the linear distance between the outsides of the sidewalls of an inflated tyre, including labelling (marking), decoration and protective bands or ribs(2); U.K.

2.14. ‘section height’ means a distance equal to half the difference between the outer diameter of the tyre and the nominal rim diameter(2); U.K.

2.15. ‘nominal aspect ratio Ra’ means one hundred times the number obtained by dividing the number expressing the nominal section height in millimetres by the number expressing the nominal section width in millimeters; U.K.

2.16. ‘outer diameter’ means the overall diameter of an inflated new tyre(2); U.K.

2.17. ‘tyre-size designation’: U.K.

2.17.1. means a designation showing: U.K.

2.17.1.1. the nominal secton width. This width must be expressed in mm, except in the case of tyres for which the size designation is shown in the first column of the tables in Appendix 5; U.K.

2.17.1.2. the nominal aspect ratio, except in the case of tyres for which the size designation is shown in the first column of the tables in Appendix 5; U.K.

2.17.1.3. a conventional number ‘d’ (the ‘d’ symbol) denoting the nominal rim diameter and corresponding to the diameter of the rim expressed either in inches (number below 100 — see table) or in mm (numbers above 100) but not both. U.K.

The exhaustive range of values is shown in the table below:
‘d’Nominal rim diameter (the symbol)
Expressed in inches(code)	Equivalence in mm(reference section 6.1.2.1)
10	254
11	279
12	305
13	330
14	356
15	381
16	406
17	432
18	457
19	483
20	508
21	533
22	559
24	610
25	635
14,5	368
16,5	419
17,5	445
19,5	495
20,5	521
22,5	572
24,5	622

2.17.1.4. the letter ‘T’ in front of the nominal section width in case of T-type temporary-use spare tyres; U.K.

2.18. ‘nominal rim diameter (d)’ means the diameter of the rim on which a tyre is designed to be mounted(3); U.K.

2.19. ‘rim’ means the support for a tyre-and-tube assembly, or for a tubeless tyre, on which the tyre beads are seated(3); U.K.

2.20. ‘theoretical rim’ means the notional rim whose width would be equal to x times the nominal section width of a tyre; the value ‘x’ must be specified by the tyre manufacturer; U.K.

2.21. ‘measuring rim’ means the rim on which a tyre must be fitted for size measurements; U.K.

2.22. ‘test rim’ means the rim on which a tyre must be fitted for testing; U.K.

2.23. ‘chunking’ means the breaking away of pieces of rubber from the tread; U.K.

2.24. ‘cord separation’ means the parting of the cords from their rubber coating; U.K.

2.25. ‘ply separation’ means the parting of adjacent plies; U.K.

2.26. ‘tread separation’ means the pulling away of the tread from the carcass; U.K.

2.27. ‘tread-wear indicators’ mean projections within the tread-grooves designed to give a visual indication of the degree of wear of the tread; U.K.

2.28. ‘load-capacity index’ means one or two numbers which indicate the load the tyre can carry in single or in single and dual formation at the speed corresponding to the associated speed category and when operated in conformity with the requirements governing utilization specified by the manufacturer. The list of these indices and their corresponding masses is given in Annex II, Appendix 2; U.K.

2.28.1. on passenger car tyres there must be one load index only; U.K.

2.28.2. on commercial vehicle tyres there may be one or two load indices, the first one for single formation and the second one, when present, for dual (twin) formation in which case the two indices are divided by a slash (/); U.K.

2.28.3. a type of tyre may have either one or two sets of load capacity indices depending on whether or not the provisions of section 6.2.5 are applied; U.K.

2.29. ‘speed category’, expressed by the speed category symbol as shown in the table in 2.29.3; U.K.

2.29.1. in the case of a passenger car tyre, the maximum speed which the tyre can sustain; U.K.

2.29.2. in the case of a commercial vehicle tyre, the speed at which the tyre can carry the mass corresponding to the load capacity index; U.K.

2.29.3. The speed categories are as shown in the table below: U.K.

Speed category symbol	Corresponding speed(km/h)
F	80
G	90
J	100
K	110
L	120
M	130
N	140
P	150
Q	160
R	170
S	180
T	190
U	200
H	210
V	240

2.29.4. tyres suitable for maximum speeds higher than 240 km/h are identified by means of the letter code ‘Z’ placed within the tyre size designation; U.K.

2.29.5. a type of tyre may have either one or two sets of speed category symbols depending on whether or not the provisions of section 6.2.5 are applied; U.K.

2.30. ‘table: Variation of load capacity with speed’ means: the table, in Annex II Appendix 8, showing as a function of the load capacity indices and nominal speed category symbols the load variations which a tyre can withstand when used at speeds different from that corresponding to its speed category symbol; U.K.

2.30.1. the load variations do not apply in the case of passenger car tyres nor, in the case of commercial vehicle tyres, to the additional load capacity indices and speed category symbol when the provisions of section 6.2.5 are applied; U.K.

2.31. ‘maximum load rating’ means the maximum mass the tyre is rated to carry: U.K.

2.31.1. in the case of passenger car tyres suitable for speeds not exceeding 210 km/h, the maximum load rating must not exceed the value associated with the load capacity index of the tyre; U.K.

2.31.2. in the case of passenger car tyres suitable for speeds exceeding 210 km/h, but not exceeding 240 km/h (tyres classified with speed category symbol ‘V’), the maximum load rating must not exceed the percentage of the value associated with the load capacity index of the tyre, indicated in the table below, with reference to the speed capability of the vehicle to which the tyre is fitted; U.K.

Maximum speed(km/h)	Load(%)
215	98,5
220	97
225	95,5
230	94
235	92,5
240	91

for intermediate maximum speeds linear interpolations of the maximum load rating are allowed;

2.31.3. for speeds exceeding 240 km/h (‘Z tyres’) the maximum load rating must not exceed the value specified by the tyre manufacturer with reference to the maximum speed capability of the vehicle to which it is fitted; U.K.

2.31.4. in the case of commercial vehicle tyres, the maximum load rating, both for single and for dual formation, must not exceed the percentage of the value associated with the relevant load capacity index of the tyre as indicated in the table ‘Load-capacity variation with speed’ (see 2.30), with reference to the speed category symbol of the tyre and the speed capability of the vehicle to which the tyre is fitted. When additional load capacity indices and speed category symbols apply, those too are considered to determine the maximum load rating of the tyre; U.K.

2.32. ‘passenger car tyre’ means a tyre designed primarily, but not only, for passenger cars (motor vehicles in category M1) and their trailers (01 and 02); U.K.

2.33. ‘commercial vehicle tyre’ means a tyre designed primarily, but not only, for vehicles other than passenger cars (motor vehicles in categories M2, M3, N) and their trailers (03, 04); U.K.

2.34. ‘tyre ground pressure (F/Ac)’ means the average until load transmitted by the tyre, through its contact area, to the road surface expressed as the ratio between the vertical force (F), in static conditions on the axis of the wheel and the tyre contact area (Ac) measured with the tyre inflated at the cold inflation pressure recommended for the intended type of service. It is expressed in kN/m²; U.K.

2.35. ‘tyre contact area (Ac)’ means the area of the flat surface contained within the virtual perimeter of the tyre footprint. It is expressed in m²; U.K.

2.36. ‘virtual perimeter of the tyre footprint’ means the convex polygonal curve circumscribing the smallest area containing all points of contact between the tyre and the ground; U.K.

2.37. ‘cold inflation pressure’ means the internal pressure of the tyre with the tyre at ambient temperature and does not include any pressure build up due to tyre usage. It is expressed in bar kPa. U.K.

3. MARKING REQUIREMENTS U.K.

3.1. Tyres must bear: U.K.

3.1.1. the manufacturer's name or trade mark; U.K.

3.1.2. the tyre-size designation as defined in section 2.17; U.K.

3.1.3. an indication of the structure as follows: U.K.

3.1.3.1. on diagonal (bias-ply) tyres, no making or the letter ‘D’; U.K.

3.1.3.2. on radial-ply tyres, the letter ‘R’ placed in front of the nominal in diameter marking and, optionally, the word ‘RADIAL’; U.K.

3.1.3.3. on bias-belted tyres, the letter ‘B’ placed in front of the nominal rim diameter marking and, in addition, the words ‘BIAS-BELTED’; U.K.

3.1.4. an indication of the tyre's speed category by means of the symbol shown in section 2.29; in the case of tyres suitable for speeds higher than 240 km/h the speed category of the tyre must be indicated by the letter code ‘Z’ placed in front of the indication of the structure (see section 3.1.3); U.K.

3.1.5. the inscription ‘M + S’ (for alternatively ‘M.S.’ or ‘M & S’) in the case of a snow tyre; U.K.

3.1.6. the load-capacity index as defined in section 2.28; U.K.

3.1.6.1. however, in the case of tyres suitable for speeds higher than 240 km/h the indication of the load capacity index may be omitted; U.K.

3.1.7. the word ‘TUBELESS’ if the tyre is designed for use without an inner tube; U.K.

3.1.8. the word ‘REINFORCED’ if the tyre is a reinforced tyre; U.K.

3.1.9. the date of manufacture in the form of a group of three digits, the first two showing the week and the last one the year of manufacture; U.K.

3.1.10. in the case of commercial vehicle tyres which can be regrooved, the symbol ‘ ’ at last 20 mm in diameter, or the word ‘REGROOVABLE’, moulded into or on to each sidewall; U.K.

3.1.11. in the case of commercial vehicles tyres, an indication, by the ‘PSI’ index (see Appendix 4), of the inflation pressure to be adopted for the load/speed tests, as explained in Appendic 7 Part B; U.K.

3.1.12. the additional load capacity index/indices and the speed category symbol in the case where the provisions of section 6.2.5 are applied. U.K.

3.2. Appendix 3 gives examples of the arrangement of tyre markings. U.K.

3.3. The tyre must also bear the [F1 EC type-approval] mark, the model of which is given in Annex I, section 4.5. U.K.

Textual Amendments

F1 Substituted by Directive 2001/43/EC of the European Parliament and of the Council of 27 June 2001 amending Council Directive 92/23/EEC relating to tyres for motor vehicles and their trailers and to their fitting.

POSITION OF MARKINGS U.K.

3.4. The markings referred to in section 3.1 and 3.3 must be clearly and legibly moulded into or on to both sidewalls, and at least on one side on the lower sidewall, as follows: U.K.

3.4.1. in the case of symmetrical tyres, all the markings referred to above must be located on both ridewalls except the markings referred to in sections 3.1.9, 3.1.11 and 3.3 which may be on one sidewall only; U.K.

3.4.2. in the case of asymmetrical tyres all the markings must be located on at least the outer sidewall. U.K.

(4.)

(5.)

(6.)

6.1. Dimensional requirements U.K.

6.1.1. Section width of a tyre U.K.

6.1.1.1. Except as provided by section 6.1.1.2, the section width is calculated by the following formula: U.K.

• S = S₁ + K (A−A₁),

where:

S

=

the ‘section width’ expressed in mm(4) and measured on the measuring rim;

S₁

=

the ‘nominal section width’ in mm as shown on the sidewall of the tyre in the tyre-size designation as prescribed;

A

=

the width (expressed in mm) of the measuring rim, as shown by the manufacturer in the descriptive note, (see section 6.11 of Annex I, Appendix 1);

A₁

=

the width (expressed in mm) of the theoretical rim; it is taken to equal S₁ multiplied by the factor x as specified by the tyre manufacturer (see section 6.15 of Annex I, Appendix 1); and K is taken to equal 0.4.

6.1.1.2. However, for the types of tyre for which the size designation is given in the first column of the tables in Appendix 5 A or 5 B, the measuring rim width (A) and the section width (S) are those given opposite the tyre size designation in those tables. U.K.

6.1.2. Outer diameter of a tyre U.K.

6.1.2.1. Except as provided by secton 6.1.2.2, the outer diameter of a tyre is calculated by the following formula: U.K.

• D = d + 0,02H

where:

• D is the outer diameter expressed in mm,

• d is the conventional number defined in section 2.17.1.3, expressed in mm,

• H is the nominal section heigth in mm and is equal to S₁ × 0,01 Ra;

where:

• Ra is the nominal aspect ratio,

all as shown on the sidewall of the tyre in the tyre-size designation in conformity with the requirements of section 3.

6.1.2.2. However, for the types of tyres for which the size designation is given in the first column of the tables of Appendix 5 the outer diameter is that given opposite the tyre size designation in those tables. U.K.

6.1.3. Method of measuring tyre dimensions U.K.

The actual dimensions of tyres are measured as prescribed in Appendix 6.

6.1.4. Tyre section width: specification of tolerance U.K.

6.1.4.1. The overall width of a tyre may be less than the section width determined pursuant to section 6.1.1 or shown in Appendix 5; U.K.

6.1.4.2. It may not exceed that value by more than the following: U.K.

6.1.4.2.1. diagonal (bias-ply) tyres: 6 % for passenger car tyres, 8 % for commercial vehicle tyres; U.K.

6.1.4.2.2. radial-ply tyres: 4 %; and U.K.

6.1.4.2.3. in addition, if the tyre has a special protective band, the figure as increased by the above tolerances may be exceeded by 8 mm. U.K.

6.1.4.2.4. However, for tyres of a section width exceeding 305 mm intended for dual (twin) mounting the nominal value must not be exceeded by more than 2 % for radial-ply or 4 % for diagonal (bias-ply) tyres. U.K.

6.1.5. Tyre outer diameter: specification of tolerance U.K.

The outer diameter of a tyre must not be outside the values Dmin and Dmax obtained from the following formulae:

Dmin

=

d + (2H × a)

Dmax

=

d + (2H × b)

6.1.5.1. for sizes listed in Appendix 5: U.K.

• H = 0,5 (D — d) — (for references see section 6.1.2.2).

6.1.5.2. for other sizes not listed in Appendix 5: U.K.

• ‘H’ and ‘d’ are as defined in section 6.1.2.1.

6.1.5.3. coefficients ‘a’ and ‘b’ are respectively: U.K.

6.1.5.3.1. coefficient ‘a’ = 0,97; U.K.

6.1.5.3.2. coefficient ‘b’ for normal, special, snow or temporary-use spare tyres U.K.

Category of use	Passenger car tyres		Commercial vehicle tyres
	Radial	Bias	Radial	Bias
Normal	1,04	1,08	1,04	1,07
Special	—	—	1,06	1,09
Snow	1,04	1,08	1,04	1,07
Temporary-use	1,04	1,08	—	—

6.1.5.4. For snow tyres the outer diameter (Dmax) established in conformity with the above may be exceeded by 1 %. U.K.

6.2. Load/speed test requirement U.K.

6.2.1. The tyre must undergo a load/speed test carried out in accordance with the relevant procedure described in Appendix 7. U.K.

6.2.2. A tyre which, after undergoing the relevant load/speed test, does not exhibit any tread separation, ply separation, cord separation, chunking or broken cords is deemed to have passed the test. U.K.

6.2.3. The outer diameter of the tyre, measured six hours after the load/speed test, must not be more than 3,5 % greater than the outer diameter as measured before the test. U.K.

6.2.4. Where application is made for the approval of a type of commercial vehicle tyre the load/speed combinations given in the table in Appendix 8 apply and, the load/speed test prescribed in section 6.2.1 need not be carried out for load and speed values other than the nominal values. U.K.

6.2.5. Where application (see secton 6.13 of Annex 1, Appendix 1) is made for the type-approval of a type of commercial vehicle tyre which has a load/speed combination in addition to the one that is subject to the variation of load with speed given in the table in Appendix 8, the load/speed test prescribed in section 6.2.1 must also be carried out on a second tyre of the same type at the additional load/speed combination. U.K.

6.2.6. Where a tyre manufacturer produces a range of tyres it is not considered necessary to carry out a load/speed test on every type of tyre in the range. Worst-case selection may be made, at the discretion of the approval authority. U.K.

6.3. Tread-wear indicators U.K.

6.3.1. In the case of passenger car tyres the tread of the tyre must include not less than six transverse rows of tread-wear indicators, approximately equally spaced and situated in the wide grooves in the central zone of the tread, which covers approximately three quarters of the tread width. The tread-wear indicators must be such that they cannot be confused with the rubber ridges between the ribs or blocks of the tread. U.K.

6.3.2. However, in the case of tyres of dimensions appropriate for mounting on rims of a nominal diamter of 12″ or less, four rows of tread-wear indicators are acceptable. U.K.

6.3.3. The tread-wear indicators must give visual warning when the depth of the corresponding tread grooves has been reduced to 1,6 mm with a tolerance of + 0,6/- 0 mm. U.K.

Appendix 1 Explanatory figure(see Annex II, sections 2 and 6.1)

Appendix 2 LIST OF SYMBOLS OF LOAD-CAPACITY INDICES (LI) AND CORRESPONDING MAXIMUM MASS TO BE CARRIED (GK)(see Annex II, section 2.28)

LI	Maximum
0	45
1	46,2
2	47,5
3	48,7
4	50
5	51,5
6	53
7	54,5
8	56
9	58
10	60
11	61,5
12	63
13	65
14	67
15	69
16	71
17	73
18	75
19	77,5
20	80
21	82,5
22	85
23	87,5
24	90
25	92,5
26	95
27	97,5
28	100
29	103
30	106
31	109
32	112
33	115
34	118
35	121
36	125
37	128
38	132
39	136
40	140
41	145
42	150
43	155
44	160
45	165
46	170
47	175
48	180
49	185
50	190
51	195
52	200
53	206
54	212
55	218
56	224
57	230
58	236
59	240
60	250
61	257
62	265
63	272
64	280
65	290
66	300
67	307
68	315
69	325
70	335
71	345
72	355
73	365
74	375
75	387
76	400
77	412
78	425
79	437
80	450
81	462
82	475
83	487
84	500
85	515
86	530
87	545
88	560
89	580
90	600
91	615
92	630
93	650
94	670
95	690
96	710
97	730
98	750
99	775
100	800
101	825
102	850
103	875
104	900
105	925
106	950
107	975
108	1 000
109	1 030
110	1 060
111	1 090
112	1 120
113	1 150
114	1 180
115	1 215
116	1 250
117	1 285
118	1 320
119	1 360
120	1 400
121	1 450
122	1 500
123	1 550
124	1 600
125	1 650
126	1 700
127	1 750
128	1 800
129	1 850
130	1 900
131	1 950
132	2 000
133	2 060
134	2 120
135	2 180
136	2 240
137	2 300
138	2 360
139	2 430
140	2 500
141	2 575
142	2 650
143	2 725
144	2 800
145	2 900
146	3 000
147	3 075
148	3 150
149	3 250
150	3 350
151	3 450
152	3 550
153	3 650
154	3 750
155	3 875
156	4 000
157	4 125
158	4 250
159	4 375
160	4 500
161	4 625
162	4 750
163	4 875
164	5 000
165	5 150
166	5 300
167	5 450
168	5 600
169	5 800
170	6 000
171	6 150
172	6 300
173	6 500
174	6 700
175	6 900
176	7 100
177	7 300
178	7 500
179	7 750
180	8 000
181	8 250
182	8 500
183	8 750
184	9 000
185	9 250
186	9 500
187	9 750
188	10 000
189	10 300
190	10 600
191	10 900
192	11 200
193	11 500
194	11 800
195	12 150
196	12 500
197	12 850
198	13 200
199	13 600
200	14 000

Appendix 3 ARRANGEMENT OF TYRE MARKINGS(see Annex II, section 3.2)

PART A: PASSENGER CAR TYRES U.K.

These markings define a tyre:

• having a nominal section width of 185,

• having a nominal aspect ratio of 70,

• of radial-ply structure (R),

• having a nominal rim diameter of 14,

• having a load capacity of 580 kg, corresponding to load index 89 in Appendix 2,

• classified in the speed category T (maximum speed 190 km/h),

• for fitting without an inner tube (‘tubeless’),

• of ‘snow’ type,

• manufactured during the twenty-fifth week of the year 1993.

The positioning and order of the markings constituting the tyre designation are as follows:

(a)

the size designation, comprising the nominal section width, the nominal aspect ratio, the type of structure symbol (where applicable) and the nominal rim diameter, must be grouped as shown in the above example: 185/70 R 14;

(b)

the load index and the speed category symbol are placed near the size designation. They may either precede or follow it or be placed above or below it;

(c)

the symbols ‘tubeless’, ‘reinforced’, and ‘M + S’ may be at a distance from the size designation.

PART B: COMMERCIAL VEHICLE TYRES U.K.

These markings define a tyre:

• having a nominal section width of 250,

• having a nominal aspect ratio of 70,

• of racial-ply structure (R),

• having a nominal rim diameter of 508 mm, for which the symbol is 20,

• having load capacities of 3 250 kg when single and 2 900 kg when twinned (dual), corresponding respectively to the load capacity indices 149 and 145 shown in Appendix 2,

• classified in the nominal speed category J (reference speed 100 km/h),

• able to be used additionally in speed category L (reference speed 120 km/h) with a load capacity of 3 000 kg when single and 2 725 kg when twinned (dual), corresponding respectively to the load capacity indices 146 and 143 shown in Appendix 2,

• for fitting without an inner tube ‘tubeless’,

• of ‘snow’ type,

• manufactured during the twenty-fifth week of the year 1991, and

• requiring to be inflated to 620 kPa for load/speed endurance tests, for which the PSI symbol is 90.

The positioning and order of the markings constituting the tyre designation are as follows:

(a)

the size designation, comprising the nominal section width, the nominal aspect ratio, the type-of-structure symbol (where applicable) and the nominal rim diameter, must be grouped as shown in the above example: 250/70 R 20;

(b)

the load indices and the speed category symbol are placed together near the size designation. They may either precede or follow it or be placed above or below it;

(c)

the symbols ‘Tubeless’, ‘M + S’ and ‘REGROOVABLE’ may be at a distance from the size designation;

(d)

if section 6.2.5 of Annex II is applied the additional load-capacity indices and speed-category symbol must be shown inside a circle near the nominal load-capacity indices and speed category symbol appearing on the tyre sidewall.

Appendix 4 RELATIONSHIP BETWEEN THE PRESSURE INDEX AND THE UNITS OF PRESSURE(see Annex II, Appendix 7, Part B, section 1.3)

Pressure Index(‘PSI’)	bar	kPa
20	1.4	140
25	1.7	170
30	2.1	210
35	2.4	240
40	2.8	280
45	3.1	310
50	3.4	340
55	3.8	380
60	4.2	420
65	4.5	450
70	4.8	480
75	5.2	520
80	5.5	550
85	5.9	590
90	6.2	620
95	6.6	660
100	6.9	690
105	7.2	720
110	7.6	760
115	7.9	790
120	8.3	830
125	8.6	860
130	9.0	900
135	9.3	930
140	9.7	970
145	10.0	1 000
150	10.3	1 030

Appendix 5 MEASURING RIM, OUTER DIAMETER AND SECTION WIDTH OF TYRES OF CERTAIN SIZE DESIGNATIONS(see Annex II, sections 6.1.1.2 and 6.1.2.2)

PART A: PASSENCER CAR TYRES U.K.

TABLE 1
Tyres in diagonal construction
a Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
b The following size designations are accepted: 185-14/7.35-14 or 185-14 or 7.35-14 or 7.35-14/185-14.
Tyre size designation	Measuring rim width(inches)	Outer diametera(in mm)	Section widtha(in mm)
Super balloon series
4.80-10	3.5	490	128
5.20-10	3.5	508	132
5.20-12	3.5	558	132
5.60-13	4	600	145
5.90-13	4	616	150
6.40-13	4.5	642	163
5.20-14	3.5	612	132
5.60-14	4	626	145
5.90-14	4	642	150
6.40-14	4.5	666	163
5.60-15	4	650	145
5.90-15	4	668	150
6.40-15	4.5	692	163
6.70-15	4.5	710	170
7.10-15	5	724	180
7.60-15	5.5	742	193
8.20-15	6	760	213
Low section series
5.50-12	4	552	142
6.00-12	4.5	574	156
7.00-13	5	644	178
7.00-14	5	668	178
7.50-14	5.5	688	190
8.00-14	6	702	203
6.00-15 L	4.5	650	156
Super low section seriesb
155-13/6.15-13	4.5	582	157
165-13/6.45-13	4.5	600	167
175-13/6.95-13	5	610	178
155-14/6.15-14	4.5	608	157
165-14/6.45-14	4.5	626	167
175-14/6.95-14	5	638	178
185-14/7.35-14	5.5	654	188
195-14/7.75-14	5.5	670	198
Ultra low section
5.9-10	4.5	483	148
6.5-13	4.5	586	166
6.9-13	4.5	600	172
7.3-13	5	614	184

TABLE 2
Tyres in radial construction
a Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
Tyre size designation	Measuring rim width(inches)	Outer diametera(in mm)	Section widtha(in mm)
5.60 R 13	4	606	145
5.90 R 13	4.5	626	155
6.40 R 13	4.5	640	170
7.00 R 13	5	644	178
7.25 R 13	5	654	184
5.90 R 14	4.5	654	155
5.60 R 15	4	656	145
6.40 R 15	4.5	690	170
6.70 R 15	5	710	180
140 R 12	4	538	138
150 R 12	4	554	150
150 R 13	4	580	149
160 R 13	4.5	596	158
170 R 13	5	608	173
150 R 14	4	606	149
180 R 15	5	676	174

TABLE 3
Millimetric series — radial
a Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
b On certain tyres the rim diameter can be expressed in mm: 10″ = 255 12″ = 305 13″ = 330 14″ = 355 15″ = 380 16″ = 405 (example: 125 R 225).
Tyre size designationb	Measuring rim width(inches)	Outer diametera(in mm)	Section widtha(in mm)
125 R 10	3.5	459	127
145 R 10	4	492	147
125 R 12	3.5	510	178
135 R 12	4	522	184
145 R 12	4	542
155 R 12	4.5	550	155
125 R 13	3.5	536	127
135 R 13	4	548	137
145 R 13	4	566	147
155 R 13	4.5	578	157
165 R 13	4.5	596	167
175 R 13	5	608	178
185 R 13	5.5	624	188
125 R 14	3.5	562	127
135 R 14	4	574	137
145 R 14	4	590	147
155 R 14	4.5	604	157
165 R 14	4.5	622	167
175 R 14	5	634	178
185 R 14	5.5	650	188
195 R 14	5.5	666	198
205 R 14	6	686	208
215 R 14	6	700	218
225 R 14	6.5	714	228
125 R 15	3.5	588	127
135 R 15	4	600	137
145 R 15	4	616	147
155 R 15	4.5	630	157
165 R 15	4.5	646	167
175 R 15	5	660	178
185 R 15	5.5	674	188
195 R 15	5.5	690	198
205 R 15	6	710	208
215 R 15	6	724	218
225 R 15	6.5	738	228
235 R 15	6.5	752	238
175 R 16	5	686	178
185 R 16	5.5	698	188
205 R 16	6	736	208

TABLE 4
70 Series — Radiala
a Dimensional data applicable to some tyres in existence. For new approvals, dimensions calculated according to sections 6.1.1.1 and 6.1.2.1 of Annex II apply.
b Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
Tyre size designation	Measuring rim width(inches)	Outer diameterb(in mm)	Section widthb(in mm)
145/70 R 10	3.5	462	139
155/70 R 10	3.5	474	146
165/70 R 10	4.5	494	165
145/70 R 12	4	512	144
155/70 R 12	4	524	151
165/70 R 12	4.5	544	165
175/70 R 12	5	552	176
145/70 R 13	4	538	144
155/70 R 13	4	550	151
165/70 R 13	4.5	568	165
175/70 R 13	4.5	580	176
185/70 R 13	5	598	186
195/70 R 13	5.5	608	197
205/70 R 13	5.5	625	204
145/70 R 14	4	564	144
155/70 R 14	4	576	151
165/70 R 14	4.5	592	165
175/70 R 14	5	606	176
185/70 R 14	5	624	186
195/70 R 14	5.5	636	197
205/70 R 14	5.5	652	206
215/70 R 14	6	665	217
225/70 R 14	6	677	225
235/70 R 14	6.5	694	239
245/70 R 14	6.5	705	243
145/70 R 15	4	590	144
155/70 R 15	4	602	151
165/70 R 15	4.5	618	165
175/70 R 15	5	632	176
185/70 R 15	5	648	186
195/70 R 15	5.5	656	197
205/70 R 15	5.5	669	202
215/70 R 15	6	682	213
225/70 R 15	6	696	220
235/70 R 15	6.5	712	234
245/70 R 15	6.5	720	239

TABLE 5
60 Series radiala
a Dimensional data applicable to some tyres in existence. For new approvals, dimensions calculated according to sections 6.1.1.1 and 6.1.2.1 of Annex III apply.
b Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
Tyre size designation	Measuring rim width(inches)	Outer diameterb(in mm)	Section widthb(in mm)
165/60 R 12	5	504	167
165/60 R 13	5	530	167
175/60 R 13	5.5	536	178
185/60 R 13	5.5	548	188
195/60 R 13	6	566	198
205/60 R 13	6	578	208
215/60 R 13	6	594	218
225/60 R 13	6.5	602	230
235/60 R 13	6.5	614	235
165/60 R 14	5	554	167
175/60 R 14	5.5	562	178
185/60 R 14	5.5	574	188
195/60 R 14	6	590	198
205/60 R 14	6	604	208
215/60 R 14	6	610	215
225/60 R 14	6	620	220
235/60 R 14	6.5	630	231
245/60 R 14	6.5	642	237
265/60 R 14	7	670	260
185/60 R 15	5.5	600	188
195/60 R 15	6	616	198
205/60 R 15	6	630	208
215/60 R 15	6	638	216
225/60 R 15	6.5	652	230
235/60 R 15	6.5	664	236
255/60 R 15	7	688	255
205/60 R 16	6	654	208
215/60 R 16	6	662	215
225/60 R 16	6	672	226
235/60 R 16	6.5	684	232

TABLE 6
High flotation tyres — radial
a Tolerances: see sections 6.1.4 and 6.1.5 of Annex II.
Tyre size designation	Measuring rim width(inches)	Outer diametera(in mm)	Section widtha(in mm)
27 × 8.50 R 14	7	674	218
30 × 9.50 R 15	7.5	750	240
31 × 10.50 R 15	8.5	775	268
31 × 11.50 R 15	9	775	290
32 × 11.50 R 15	9	801	290
33 × 12.50 R 15	10	826	318

PART B: COMMERCIAL VEHICLE TYRES U.K.

TABLE 1
Commercial vehicle tyres
RADIAL NORMAL SECTION SIZES MOUNTED ON 5o-TAPERED OR FLAT BASE RIMS
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
6.50 R 20	5.00	860	181
7.00 R 16	5.50	784	198
7.00 R 18	5.50	842	198
7.00 R 20	5.50	892	198
7.50 R 16 and/or A16 or 1-16	6.00	802	210
7.50 R 17 and/or A17 or 1-17	6.00	852	210
7.50 R 20 and/or A20 or 1-20	6.00	928	210
8.25 R 16 and/or B16 or 2-16	6.50	860	230
8.25 R 17 and/or B17 or 2-17	6.50	886	230
8.25 R 20 and/or B20 or 2-20	6.50	962	230
9.00 R 16 and/or C16 or 3-16	6.50	912	246
9.00 R 20 and/or C20 or 3-20	7.00	1 018	258
10.00 R 20 and/or D20 or 4-20	7.50	1 052	275
10.00 R 22 and/or D22 or 4-22	7.50	1 102	275
11.00 R 16	6.50	980	279
11.00 R 20 and/or E20 or 5-20	8.00	1 082	286
11.00 R 22 and/or E22 or 5-22	8.00	1 132	286
11.00 R 24 and/or E24 or 5-24	8.00	1 182	286
12.00 R 20 and/or F20 or 6-20	8.50	1 122	313
12.00 R 22	8.50	1 174	313
12.00 R 24 and/or F24 or 6-24	8.50	1 226	313
13.00 R 20	9.00	1 176	336
14.00 R 20 and/or G20 or 7-20	10.00	1 238	370
14.00 R 22	10.00	1 290	370
14.00 R 24	10.00	1 340	370

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 2
Commercial vehicle tyres
DIAGONAL
DIAGONAL NORMAL SECTION SIZES MOUNTED ON 5o-TAPERED OR FLAT BASE RIMS
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
7.00-16	5.50	774	198
7.00-20	5.50	898	198
7.50-16 and/or A16 or 1-16	6.00	806	210
7.50-17 and/or A17 or 1-17	6.00	852	210
7.50-20 and/or A20 or 1-20	6.00	928	213
8.25-16 and/or B16 or 2-16	6.50	860	234
8.25-17 and/or B17 or 2-17	6.50	895	234
8.25-20 and/or B20 or 2-20	6.50	970	234
9.00-16	6.50	900	252
9.00-20 and/or C20 or 3-20	7.00	1 012	256
9.00-24 and/or C24 or 3-24	7.00	1 114	256
10.00-20 and/or D20 or 4-20	7.50	1 050	275
10.00-22 and/or D22 or 4-22	7.50	1 102	275
11.00-20 and/or E20 or 5-20	8.00	1 080	291
11.00-22 and/or E22 or 5-22	8.00	1 130	291
11.00-24 and/or E24 or 5-24	8.00	1 180	291
12.00-18	8.50	1 070	312
12.00-20 and/or F20 or 6-20	8.50	1 120	312
12.00-22 and/or F22 or 6-22	8.50	1 172	312
12.00-24 and/or F24 or 6-24	8.50	1 220	312
13.00-20	9.00	1 170	342
14.00-20 and/or G20 or 7-20	10.00	1 238	375
14.00-22 and/or G22 or 7-22	10.00	1 290	375
14.00-24 and/or G24 or 7-24	10.00	1 340	375
15.00-20	11.25	1 295	412
16.00-20	13.00	1 370	446

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 3
Commercial vehicle tyres
RADIAL NORMAL SECTION SIZES MOUNTED ON 15o-TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
8 R 17.5	6.00	784	208
8.5 R 17.5	6.00	802	215
9 R 17.5	6.75	820	230
9.5 R 17.5	6.75	842	240
10 R 17.5	7.50	858	254
11 R 17.5	8.25	900	279
7 R 19.5	5.25	800	185
8 R 19.5	6.00	856	208
8 R 22.5	6.00	936	208
9 R 19.5	6.75	894	230
9 R 22.5	6.75	970	230
9.5 R 19.5	6.75	916	240
10 R 19.5	7.50	936	254
10 R 22.5	7.50	1 020	254
11 R 19.5	8.25	970	279
11 R 22.5	8.25	1 050	279
11 R 24.5	8.25	1 100	279
12 R 19.5	9.00	1 008	300
12 R 22.5	9.00	1 084	300
13 R 22.5	9.75	1 124	320

TABLE 4
DIAGONAL NORMAL SECTION SIZES MOUNTED ON 15o-TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
8-19.5	6.00	856	208
9-19.5	6.75	894	230
9-22.5	6.75	970	230
10-22.5	7.50	1 020	254
11-22.5	8.25	1 054	279
11-24.5	8.25	1 100	279
12-22.5	9.00	1 084	300

Tolerance: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 5
Commercial vehicle tyres
RADIAL ‘WIDE BASE’ SIZES MOUNTED ON 15o-TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
14 R 19.5	10.50	962	349
15 R 19.5	11.75	998	387
15 R 22.5	11.75	1 074	387
16.5 R 19.5	13.00	1 046	425
16.5 R 22.5	13.00	1 122	425
18 R 19.5	14.00	1 082	457
18 R 22.5	14.00	1 158	457
19.5 R 19.5	15.00	1 134	495
21 R 22.5	16.50	1 246	540

TABLE 6
DIAGONAL ‘WIDE BASE’ SIZES MOUNTED ON 15o-TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
15-19.5	11.75	1 004	387
15-22.5	11.75	1 080	387
16.5-19.5	13.00	1 052	425
16.5-22.5	13.00	1 128	425
18-19.5	14.00	1 080	457
18-22.5	14.00	1 156	457
19.5-19.5	15.00	1 138	495
21-22.5	16.50	1 246	540

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 7
Commercial vehicle tyres
RADIAL ‘80’ SERIES MOUNTED ON 5o TAPERED OR FLAT-BASE RIMS
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
12/80 R 20	8.50	1 008	305
13/80 R 20	9.00	1 048	326
14/80 R 20	10.00	1 090	350
14/80 R 24	10.00	1 192	350
14.75/80 R 20	10.00	1 124	370
15.5/80 R 20	10.00	1 158	384

TABLE 8
RADIAL ‘70’ SERIES MOUNTED ON 15o TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
9/70 R 22.5	6.75	892	229
10/70 R 22.5	7.50	928	254
11/70 R 22.5	8.25	962	279
12/70 R 22.5	9.00	999	305
13/70 R 22.5	9.75	1 033	330

TABLE 9
RADIAL ‘80’ SERIES MOUNTED ON 15o TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
12/80 R 22.5	9.00	1 046	305

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 10
Commercial vehicle tyres
RADIAL TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON RIM OF 16″ DIAMETER AND OVER
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
6.00 R 16 C	4.50	728	170
6.00 R 18 C	4.00	782	165
6.50 R 16 C	4.50	742	176
6.50 R 17 C	4.50	772	176
6.50 R 17 LC	4.50	726	166
6.50 R 20 C	5.00	860	181
7.00 R 16 C	5.50	778	198
7.50 R 16 C	6.00	802	210
7.50 R 17 C	6.00	852	210

TABLE 11
DIAGONAL TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON RIM OF 16″ DIAMETER AND OVER
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
6.00-16 C	4.50	730	170
6.00-18 C	4.00	786	165
6.00-20 C	5.00	842	172
6.50-20 C	4.50	748	176
6.50-17 LC	4.50	726	166
6.50-20 C	5.00	870	181
7.00-16 C	5.50	778	198
7.00-18 C	5.50	848	198
7.00-20 C	5.50	898	198
7.50-16 C	6.00	806	210
7.50-17 C	6.00	852	210
8.25-16 C	6.50	860	234
8.90-16 C	6.50	885	250
9.00-16 C	6.50	900	252

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 12

Commercial vehicle tyres

RADIAL TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON 5o TAPERED RIMS
Rim diameter 12″ — 15″
(DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
‘Super balloon’ series
5.60 R 12 C	4.00	570	150
6.40 R 13 C	5.00	648	172
6.70 R 13 C	5.00	660	180
6.70 R 14 C	5.00	688	180
6.70 R 15 C	5.00	712	180
7.00 R 15 C	5.50	744	195
‘Low section’ series
6.50 R 14 C	5.00	640	170
7.00 R 14 C	5.00	650	180
7.50 R 14 C	5.50	686	195

TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON 15o TAPERED RIMS (DROP-CENTRE)
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
7 R 17.5 C	5.25	752	185
8 R 17.5 C	6.00	784	208

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 13
Commercial vehicle tyres
DIAGONAL TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON 5o TAPERED RIMS (DROP CENTRE)
Rim diameter 12″ — 15″
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
‘Super balloon’ series
5.20-12 C	3.50	560	136
5.60-12 C	4.00	572	148
5.60-13 C	4.00	598	148
5.90-13 C	4.50	616	158
5.90-14 C	4.50	642	158
5.90-15 C	4.50	668	158
6.40-13 C	5.00	640	172
6.40-14 C	5.00	666	172
6.40-15 C	5.00	692	172
6.40-16 C	4.50	748	172
6.70-13 C	5.00	662	180
6.70-14 C	5.00	688	180
6.70-15 C	5.00	714	180
‘Low section’ series
5.50-12 C	4.00	552	142
6.00-12 C	4.50	574	158
6.00-14 C	4.50	626	158
6.50-14 C	5.00	650	172
6.50-15 C	5.00	676	172
7.00-14 C	5.00	668	182
7.50-14 C	5.50	692	192
‘Balloon’ series
7.00-15 C	5.50	752	198
7.50-15 C	6.00	780	210
‘Millimetric’ series
125-12 C	3.50	514	127
165-15 C	4.50	652	167
185-14 C	5.50	654	188
195-14 C	5.50	670	198
245-16 C	7.00	798	248
17-15 C or	5.00	678	178
17-380 C	5.00	678	178
17-400 C	19 × 400 mm	702	186
19-400 C	19 × 400 mm	736	200
21-400 C	19 × 400 mm	772	216

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 14
Commercial vehicle tyres
RADIAL TYRES FOR LIGHT COMMERCIAL VEHICLES MOUNTED ON 5o TAPERED RIMS (DROP-CENTRE) RIMS
‘Millimetric’ series
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
125 R 12 C	3.50	510	127
125 R 13 C	3.50	536	127
125 R 14 C	3.00	562	127
125 R 15 C	3.50	588	127
135 R 12 C	4.00	522	137
135 R 13 C	4.00	548	137
135 R 14 C	4.00	574	137
135 R 15 C	4.00	600	137
145 R 10 C	4.00	492	147
145 R 12 C	4.00	542	147
145 R 13 C	4.00	566	147
145 R 14 C	4.00	590	147
145 R 15 C	4.00	616	147
155 R 12 C	4.50	550	157
155 R 13 C	4.50	578	157
155 R 14 C	4.50	604	157
155 R 15 C	4.50	630	157
155 R 16 C	4.50	656	157
165 R 13 C	4.50	596	167
165 R 14 C	4.50	622	167
165 R 15 C	4.50	646	167
165 R 16 C	4.50	672	167
175 R 13 C	5.00	608	178
175 R 14 C	5.00	634	178
175 R 15 C	5.00	660	178
175 R 16 C	5.00	684	178
185 R 13 C	5.50	624	188
185 R 14 C	5.50	650	188
185 R 15 C	5.50	674	188
185 R 16 C	5.50	700	188
195 R 14 C	5.50	666	198
195 R 15 C	5.50	690	198
195 R 16 C	5.50	716	198
205 R 14 C	6.00	686	208
205 R 15 C	6.00	710	208
205 R 16 C	6.00	736	208
215 R 14 C	6.00	700	218
215 R 15 C	6.00	724	218
215 R 16 C	6.00	750	218
225 R 14 C	6.50	714	228
225 R 15 C	6.50	738	228
225 R 16 C	6.50	764	228
235 R 14 C	6.50	728	238
235 R 15 C	6.50	752	238
235 R 16 C	6.50	778	238
17 R 15 C or	5.00	678	178
17 R 380 C	5.00	678	178
17 R 400 C	19 × 400 mm	698	186
19 R 400 C	19 × 400 mm	728	200

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 15
Commercial vehicle tyres
DIAGONAL WIDE-BASE TYRES FOR MULTIPURPOSE TRUCKS ON HIGHWAY, OFF-THE-ROAD AND AGRICULTURAL SERVICES
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
10.5-18 MPT	9	905	270
10.5-20 MPT	9	955	270
12.5-18 MPT	11	990	325
12.5-20 MPT	11	1 040	325
14.5-20 MPT	11	1 095	355
14.5-24 MPT	11	1 195	355
7.50-18 MPT	5.50	885	208

TABLE 16
RADIAL WIDE-BASE TYRES FOR MULTIPURPOSE TRUCKS ON HIGHWAY, OFF-THE-ROAD AND AGRICULTURAL SERVICES
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
10.5 R 20 MPT	9	955	276
12.5 R 20 MPT	11	1 040	330
14.5 R 20 MPT	11	1 095	362
14.5 R 24 MPT	11	1 195	362

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 17
Commercial vehicle tyres
RADIAL ‘FREE-ROLLING’ TYRES IN HIGHWAY SERVICE
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
5.00 R 8	3.00	467	132
6.00 R 9	4.00	540	160
7.00 R 12	5.00	672	192
7.50 R 15	6.00	772	212
8.25 R 15	6.50	836	234
10.00 R 15	7.50	918	275

TABLE 18
DIAGONAL ‘FREE-ROLLING’ TYRES IN HIGHWAY SERVICE
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
6.00-9	4.00	540	160
7.00-12	5.00	672	192
7.00-15	5.00	746	192
7.50-15	6.00	772	212
8.25-15	6.50	836	234
10.00-15	7.50	918	275
200-15	6.50	730	205

TABLE 19
DIAGONAL ‘75’ SERIES MOUNTED ON 15o TAPERED RIMS
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
7.25/75-16.5 or 7.25-16.5	5.25	695	182
8.00/75-16.5 or 8.00-16.5	6.00	724	203
8.75/75-16.5 or 8.75-16.5	6.75	752	224
9.50/75-16.5 or 9.50-16.5	7.50	781	245

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 20

Commercial vehicle tyres

DIAGONAL
DIAGONAL AND RADIAL TYRES MOUNTED ON FLAT BASE OR DIVIDED RIMS
a Also marked 18 × 7.
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
3.00-4	2.10	255	81
4.00-4	2.50	312	107
4.00-8	2.50	414	107
5.00-8	3.00	467	132
6.50-10	5.00	588	177
7.00-9	5.00	562	174
7.50-10	5.50	645	207
8.25-10	6.50	698	240
10.50-13	6.00	889	275
10.50-16	6.00	965	275
11.00-16	6.00	952	272
14.00-16	10.00	1 139	375
15 × 4.5-2	3.25	385	122
16 × 6-8	4.33	425	152
18 × 7-8a	4.33	462	173
21 × 4	2.32	565	113
21 × 8-9	6.00	535	200
23 × 9-10	6.50	595	225
22 × 4.5	3.11	595	132
23 × 5	3.75	635	155
25 × 6	3.75	680	170
27 × 6	4.33	758	188
27 × 10-12	8.00	690	255
28 × 6	3.75	760	170
28 × 9-15	7.00	707	216
(8.15-15)	7.00	707	216
29 × 7	5.00	809	211
29 × 8	6.00	809	243
9.00-15	6.00	840	249
2.50-15	7.50	735	250
3.00-15	8.00	840	300

RADIAL
Tyre size designation	Measuring-rim width(in inches)	Outer diameter(in mm)	Section width(in mm)
6.50 R 10	5.00	588	177
7.00 R 15	5.50	746	197
7.50 R 10	5.50	645	207
15 × 4.5 R 8	3.25	385	122
16 × 6 R 8	4.33	425	152
18 × 7 R 8	4.33	462	173
560 × 165 R 11	5.00	560	175
680 × 180 R 15	5.00	680	189

Tolerances: see sections 6.1.4 and 6.1.5 of Annex II. U.K.

TABLE 21
Tyres for trucks, buses, trailers and multipurpose passenger vehicles in normal highway service
DIAGONAL AND RADIAL TYRES MOUNTED ON 5o DROP-CENTRE OR SEMI-DROP-CENTRE RIMS
a Overall tyre widths may exceed the above section widths by 8 %.
b Tolerance + 8 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(in inches)	Section width(in mm)a	Outer diameter
Diagonal	Radial			Highway tread(in mm)b	Mud and snow(in mm)b
6.00-16 LT	6.00 R 16 LT	4.50	173	732	743
6.50-16 LT	6.50 R 16 LT	4.50	182	755	767
6.70-15 LT	6.70 R 15 LT	5.00	191	722	733
7.00-13 LT	7.00 R 13 LT	5.00	187	647	658
7.00-14 LT	7.00 R 14 LT	5.00	187	670	681
7.00-15 LT	7.00 R 15 LT	5.50	202	752	763
7.00-16 LT	7.00 R 16 LT	5.50	202	778	788
7.10-15 LT	7.10 R 15 LT	5.00	199	738	749
7.50-15 LT	7.50 R 15 LT	6.00	220	782	794
7.50-16 LT	7.50 R 16 LT	6.00	220	808	819
8.25-16 LT	8.25 R 16 LT	6.50	241	859	869
9.00-16 LT	9.00 R 16 LT	6.50	257	890	903
D78-14 LT	DR 78-14 LT	5.00	192	661	672
E78-14 LT	ER 78-14 LT	5.50	199	667	678
C78-15 LT	CR 78-15 LT	5.00	187	672	683
G78-15 LT	GR 78-15 LT	6.00	212	711	722
H78-15 LT	HR 78-15 LT	6.00	222	727	739
L78-15 LT	LR 78-15 LT	6.50	236	749	760
F78-16 LT	FR 78-16 LT	5.50	202	721	732
H78-16 LT	HR 78-16 LT	6.00	222	753	764
L78-16 LT	LR 78-16 LT	6.50	236	775	786

TABLE 22

Tyres for trucks, buses, trailers and multipurpose passenger vehicles in normal highway service

DIAGONAL AND RADIAL TYRES MOUNTED ON 15^o DROP-CENTRE RIMS

TABLE 22.1
a Overall tyre widths may exceed the above section widths by 8 %.
b Tolerance + 8 % of the difference between the above outer diameters and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radial			Highway tread(mm)b	Mud and snow(mm)b
7-14.5 LT	—	6.00	185	677	—
8-14.5 LT	—	6.00	203	707	—
9-14.5 LT	—	7.00	241	711	—
7-17.5 LT	7 R 17.5 LT	5.25	189	758	769
8-17.5 LT	8 R 17.5 LT	5.25	199	788	799

TABLE 22.2
a Overall tyre widths may exceed the above section widths by 7 %.
b Tolerance + 8 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radial			Highway tread(mm)b	Mud and snow(mm)b
8.00-16.5 LT	8.00 R 16.5 LT	6.00	203	720	730
8.75-16.5 LT	8.75 R 16.5 LT	6.75	222	748	759
9.50-16.5 LT	9.50 R 16.5 LT	6.75	241	776	787
10-16.5 LT	10 R 16.5 LT	8.25	264	762	773
10-17.5 LT	10 R 17.5 LT	8.25	264	787	798
12-16.5 LT	12 R 16.5 LT	9.75	307	818	831
30 × 9.50-16.5 LT	30 × 9.50 R 16.5 LT	7.50	240	750	761
31 × 10.50-16.5 LT	31 × 10.50 R 16.5 LT	8.25	266	775	787
33 × 10.50-16.5 LT	33 × 12.50 R 16.5 LT	9.75	315	826	838
37 × 10.50-16.5 LT	37 × 14.50 R 16.5 LT	11.25	365	928	939

TABLE 23
Tyres for trucks, buses, trailers in normal highway service
DIAGONAL AND RADIAL TYRES MOUNTED ON 15o DROP-CENTRE RIMS
a Overall tyre widths may exceed the above section widths by 6 %.
b Tolerance + 5 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radial			Highway tread(mm)b	Heavy tread(mm)b	Mud and snow(mm)b
Normal-section tyres
7-22.5	7 R 22.5	5.25	178	878	—	894
8-19.5	8 R 19.5	6.00	203	859	—	876
8-22.5	8 R 22.5	6.00	203	935	—	952
9-22.5	9 R 22.5	6.75	229	974	982	992
10-22.5	10 R 22.5	7.50	254	1 019	1 031	1 038
11-22.5	11 R 22.5	8.25	279	1 054	1 067	1 037
11-24.5	11 R 24.5	8.25	279	1 104	1 118	1 123
12-22.5	12 R 22.5	9.00	300	1 085	1 099	1 104
12-24.5	12 R 24.5	9.00	300	1 135	1 150	1 155
12.5-22.5	12.5 R 22.5	9.00	302	1 085	1 099	1 104
12.5-22.5	12.5 R 24.5	9.00	302	1 135	1 150	1 155
Wide-base tyres
14-17.5	14 R 17.5	10.50	349	907	—	921
15-19.5	15 R 19.5	11.75	389	1 005	—	1 019
15-22.5	15 R 22.5	11.75	389	1 082	—	1 095
16.5-19.5	16.5 R 19.5	13.00	425	1 052	—	1 068
16.5-22.5	16.5 R 22.5	13.00	425	1 128	—	1 144
18-19.5	18 R 19.5	14.00	457	1 080	—	1 096
18-22.5	18 R 22.5	14.00	457	1 158	—	1 172
19.5-19.5	19.5 R 19.5	15.00	495	1 138	—	1 156

TABLE 24
Tyres for trucks, buses, trailers in normal highway service
DIAGONAL AND RADIAL TYRES MOUNTED ON 5o DROP-CENTRE RIMS
a Overall tyre widths may exceed the above section widths by 6 %.
b Tolerance + 6 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radial			Highway tread(mm)b	Heavy tread(mm)b	Mud and snow(mm)b
—	8R14LT	7.00	216	667	—	—
9-15LT	—	8.00	254	744	755	—
10-15LT	10R15LT	8.00	264	773	783	—
10-16LT	—	8.00	264	798	809	—
11-14LT	—	8.00	279	752	763	—
11-15LT	11R15LT	8.00	279	777	788	—
11-16LT	—	8.00	279	803	813	—
12-15LT	—	10.00	318	823	834	—
—	9R15LT	8.00	254	744	755	752
24 × 7.50-13LT	24 × 7.50R13LT	6.00	191	597	609	604
27 × 8.50-14LT	27 × 8.50-14LT	7.00	218	674	685	680
28 × 8.50-15LT	28 × 8.50-15LT	7.00	218	699	711	705
29 × 9.50-15LT	29 × 9.50-15LT	7.50	240	724	736	731
30 × 9.50-15LT	30 × 9.50-15LT	7.50	240	750	761	756
31 × 10.50-15LT	31 × 10.50-15LT	8.50	268	775	787	781
31 × 11.50-15LT	31 × 11.50-15LT	9.00	290	775	787	781
32 × 11.50-15LT	32 × 11.50-15LT	9.00	290	801	812	807
33 × 12.50-15LT	33 × 12.50-15LT	10.00	318	826	838	832
35 × 12.50-15LT	35 × 12.50-15LT	10.00	318	877	888	883
37 × 12.50-15LT	37 × 12.50-15LT	10.00	318	928	939	934
31 × 13.50-15LT	31 × 13.50-15LT	11.00	345	775	787	781
37 × 14.50-15LT	37 × 14.50-15LT	12.00	372	928	939	934
31 × 15.50-15LT	31 × 15.50-15LT	12.00	390	775	787	781

TABLE 25
Tyres for trucks, buses and trailers in normal highway service
DIAGONAL AND RADIAL TYRES MOUNTED ON MULTI-PIECE BYMS
a Overall tyre widths may exceed the above section widths by 6 %.
b Tolerance + 6 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radhal			Highway tread(mm)b	Heavy tread(mm)b	Mud and snow(mm)b
6.50-20	6.50R20	5.00	184	878	—	1 049
7.00-15TR	7.00R15TR	5.50	199	777	—	962
7.00-17	7.00R17	5.50	199	828	—	843
7.00-18	7.00R18	5.50	199	853	—	868
7.00-20	7.00R20	5.50	199	904	—	919
7.50-15TR	7.50R15TR	6.00	215	808	—	825
7.50-17	7.50R17	6.00	215	859	—	876
7.50-18	7.50R18	6.00	215	884	—	981
7.50-20	7.50R20	6.00	215	935	—	952
8.25-15TR	8.25R15TR	6.50	236	847	855	865
8.25-17	8.25R17	6.50	236	898	906	915
8.25-20	8.25R20	6.50	236	974	982	992
9.00-15TR	9.00R15TR	7.00	259	891	904	911
9.00-20	9.00R20	7.00	259	1 019	1 031	1 038
10.00-15TR	10.00R15TR	7.50	278	927	940	946
10.00-20	10.00R20	7.50	278	1 054	1 067	1 073
10.00-22	10.50R22	7.50	278	1 104	1 118	1 123
11.00-15TR	11.00R15TR	8.00	293	958	972	977
11.00-20	11.00R20	8.00	293	1 085	1 099	1 104
11.00-22	11.00R22	8.00	293	1 135	1 150	1 155
11.00-24	11.00R24	8.00	293	1 186	1 201	1 206
11.50-20	11.50R20	8.00	296	1 085	1 099	1 104
11.50-22	11.50R22	8.00	296	1 135	1 150	1 155
12.50-20	12.00R20	8.50	315	1 125	—	1 146
12.50-24	12.00R24	8.50	315	1 226	—	1 247

TABLE 26
Tyres for trucks and trailers in highway service at restricted speeds
DIAGONAL AND RADIAL TYRES MOUNTED ON MULTI-PIECE RIMS
a Overall tyre widths may exceed the above section widths by 6 %.
b Tolerance + 6 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation		Measuring-rim width(inches)	Section width(mm)a	Outer diameter
Diagonal	Radial			Highway tread(mm)b	Mud and snow(mm)b
13.00-20	13.00R20	9.00	340	1 177	1 200
14.00-20	14.00R20	10.00	375	1 241	1 266
14.00-24	14.00R24	10.00	375	1 343	1 368

TABLE 27
Tyres for mobile homes in highway service
DIAGONAL
a Overall tyre widths may exceed the above section widths by 8 %.
b Tolerance + 8 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation	Measuring-rim width(inches)	Section width(mm)a	Outer diameter(mm)b
Tyres mounted on 15o drop-centre rims
7-14.5 MH	6.00	185	677
8-14.5 MH	6.00	203	707
9-14.5 MH	7.00	241	711
Tyres mounted on 5o drop-centre and semi-drop-centre rims
7.00-15 MH	5.50	202	752

TABLE 28
Mining and logging tyres in intermittent highway service
DIAGONAL
a Overall tyre widths may exceed the above section widths by 8 %.
b Tolerance + 6 % of the difference between the above outer diameter and the nominal rim diameters.
Tyre size designation	Measuring-rim width(inches)	Section width(mm)a	Outer diameter
			Traction tread(mm)b	Extra tread(mm)b
Tyres mounted on 15o drop-centre rims
7.00-20 ML	5.50	199	919	—
7.50-20 ML	6.00	215	952	—
8.25-20 ML	6.50	236	992	—
9.00-20 ML	7.00	259	1 038	1 063
10.00-20 ML	7.50	278	1 073	1 099
10.00-22 ML	7.50	278	1 123	1 150
10.00-20 ML	7.50	278	1 174	1 200
11.00-20 ML	8.00	293	1 104	1 131
11.00-22 ML	8.00	293	1 155	1 182
11.00-24 ML	8.00	293	1 206	1 233
12.00-20 ML	8.50	315	1 146	1 173
12.00-24 ML	8.50	315	1 247	1 275
13.00-20 ML	9.00	340	1 200	—
13.00-24 ML	9.00	340	1 302	—
14.00-20 ML	10.00	375	1 266	—
14.00-24 ML	10.00	375	1 368	—
Tyres mounted on full-tapered bead seat rims
11.00-25 ML	8.50	298	1 206	1 233
12.00-21 ML	8.50	315	1 146	1 175
12.00-25 ML	8.50	315	1 247	1 275
13.00-25 ML	10.00	351	1 302	—
14.00-21 ML	10.00	375	1 266	—
14.00-25 ML	10.00	375	1 368	—
Tyres mounted on 15o drop-centre rims
9-22.5 ML	6.75	229	992	—
10-22.5 ML	7.50	254	1 038	—
11-22.5 ML	8.25	279	1 073	—
11-24.5 ML	8.25	279	1 123	—
12-22.5 ML	9.00	300	1 104	—
Tyres mounted on 15o drop-centre rims
14-17.5 ML	10.50	349	921	—
15-19.5 ML	11.75	389	1 019	—
15-22.5 ML	11.75	389	1 095	—
16.5-19.5 ML	13.00	425	1 068	—
16.5-22.5 ML	13.00	425	1 144	—
18-19.5 ML	14.00	457	1 096	—
18-22.5 ML	14.00	457	1 172	—
19.5-19.5 ML	15.00	495	1 156	—
23-23.5 ML	17.00	584	1 320	—

Appendix 6 METHOD OF MEASURING TYRE DIMENSIONS(see Annex II section 6.1.3)

PART A: PASSENGER CAR TYRES U.K.

1.1. The tyre is mounted on the measuring rim specified by the manufacturer pursuant to section 6.11 of Annex I, Appendix 1. U.K.

1.2. The pressure in the tyre is then adjusted as follows: U.K.

1.2.1. in standard bias — belted tyres to 1,7 bar; U.K.

1.2.2. in diagonal (bias-ply) tyres to the pressure shown below (bar): U.K.

Ply-rating	Speed category
	L, M, N	P, Q, R, S	T, U, H, V
4	1,7	2,0	—
6	2,1	2,4	2,6
8	2,5	2,8	3,0

1.2.3. in standard radial tyres to 1,8 bar, U.K.

1.2.4. in reinforced tyres to 2,3 bar, and U.K.

1.2.5. in T-type temporary-use spare tyres: to 4,2 bar. U.K.

2. The tyre, mounted on its rim, is conditioned at the ambient room temperature for not less than 24 hours, with the exception referred to in section 6.2.3 of Annex II. U.K.

3. The pressure is readjusted to that specified in section 1.2. U.K.

4. The overall width is measured by caliper at six equally-spaced points, account being taken of the thickness of the protective ribs or bands. The highest measurement so obtained is taken as the overall width. U.K.

5. The outer diameter is determined by measuring the maximum circumference and dividing the figure so obtained by π (3,1416). U.K.

PART B: COMMERCIAL VEHICLE TYRES U.K.

1. The tyre is mounted on the measuring rim specified by the manufacturer pursuant to section 6.11 of Appendix 1 to Annex I and is inflated to a pressure specified by the manufacturer pursuant to section 6.12 of Annex I, Appendix 1. U.K.

2. The tyre fitted on its rim is conditioned to the ambient temperature of the laboratory for at least 24 hours. U.K.

3. The pressure is readjusted to the value specified in section 1. U.K.

4. The overall width is measured by caliper at six equally-spaced points, account being taken of the thickness of the protective ribs or bands. The highest measurement so obtained is taken as the overall width. U.K.

5. The outer diameter is determined by measuring the maximum circumference and dividing the figure so obtained by π (3,1416). U.K.

Appendix 7 LOAD/SPEED TEST-PROCEDURE(5) (see Annex II, section 6.2)

PART A: PASSENGER CAR TYRES U.K.

1. Preparing the tyre U.K.

1.1. A new tyre is mounted on the test rim specified by the manufacturer pursuant to section 6.11 of Annex I, Appendix 1. U.K.

1.2. It is inflated to the appropriate pressure as given in the table below: U.K.

Test pressure (bar)
T-type temporary use spare tyres: to 4,2 bars.
Speed category	Diagonal (bias-ply) tyres			Radial tyres		Bias-belted tyres
	Ply-rating			Standard	Reinforced	Standard
	4	6	8
L, M, N	2,3	2,7	3,0	2,4	—	—
P, Q, R, S	2,6	3,0	3,3	2,6	3,0	2,6
T, U, H	2,8	3,2	3,5	2,8	3,2	2,8
V	3,0	3,4	3,7	3,0	—	—

1.3. The manufacturer may request, giving reasons, the use of an inflation pressure differing from those under section 1.2. In such a case the tyre is inflated to that pressure (see section 6.14 of Appendix 1 to Annex I). U.K.

1.4. The tyre-and-wheel assembly is conditioned at test-room temperature for not less than three hours. U.K.

1.5. The tyre pressure is readjusted to that specified in section 1.2 or 1.3. U.K.

2. Carrying out the test U.K.

2.1. The tyre-and-wheel assembly is mounted on a test axle and pressed against the outer face of a smooth wheel 1,70 m ± 1 % or 2 m ± 1 % in diameter. U.K.

2.2. Apply to the test axle a load equal to 80 % of: U.K.

2.2.1. the maximum load rating equated to the load capacity index for tyres with speed symbols L to H inclusive: U.K.

2.2.2. the maximum load rating associated with a maximum speed of 240 km/h for tyres with speed symbol ‘V’ (see section 2.31.2 of Annex II). U.K.

2.3. Throughout the test the tyre pressure must not be corrected and the test load must be kept constant. U.K.

2.4. During the test the temperature in the test-room must be maintained at between 20 ^oC and 30 ^oC or at a higher temperature if the manufacturer agrees. U.K.

2.5. The test is carred out without interruption in conformity with the following particulars: U.K.

2.5.1. time taken to pass from zero speed to initial test speed: 10 minutes; U.K.

2.5.2. initial test speed: prescribed maximum speed for the type of tyre, less 40 km/h in the case of the smooth wheel having 1,70 m ± 1 % in diameter or less 30 km/h in the case of the smooth wheel having 2 m ± 1 % in diameter; U.K.

2.5.3. successive speed increments: 10 km/h; U.K.

2.5.4. duration of test at each speed step except the last: 10 minutes; U.K.

2.5.5. duration of test at last speed step: 20 minutes; U.K.

2.5.6. maximum test speed: prescribed maximum speed for the type of tyre, less 10 km/h in the case of the smooth wheel having 1,7 m ± 1 % in diameter or equal to prescribed maximum speed in the case of the smooth wheel having 2 m ± 1 % in diameter. U.K.

3. Equivalent test methods U.K.

If a method other than that described in section 2 is used, its equivalence must be demonstrated.

PART B: COMMERCIAL VEHICLE TYRES(6) U.K.

1. Preparing the tyre U.K.

1.1. Mount a new tyre on the test rim specified by the manufacturer pursuant to section 6.11 of Appendix 1 to Annex I. U.K.

1.2. Use a new inner tube or combination of inner tube, valve and flap (as required) when testing tyres with inner tubes. U.K.

1.3. Inflate the tyre to the pressure corresponding to the pressure index specified by the tyre manufacturer, pursuant to section 6.14 of Appendix 1 to Annex I. U.K.

1.4. Condition the tyre and wheel assembly at test room temperature for not less than three hours. U.K.

1.5. Readjust the tyre pressure to that specified in section 1.3. U.K.

2. Test procedure U.K.

2.1. Mount the tyre and wheel assembly on the test axle and press it against the outer face of a smooth power-driven test drum 1,70 m ± 1 % in diameter having a surface at least as wide as the tyre tread. U.K.

2.2. Apply to test axle a series of test loads expressed as a percentage of the load indicated in Appendix 2, opposite the load index moulded on the sidewall of the tyre, in accordance with the load/speed test programme shown in the Table below. When the tyre has load capacity indices for both single and twin utilization, the reference load for single utilization is taken as the basis for the test loads. U.K.

2.3. The tyre pressure must not be corrected throughout the test and the test load must be kept constant throughout each of the three test stages. U.K.

2.4. During the test the temperature in the test room must be maintained at between 20 ^oC and 30 ^oC or at a higher temperature if the manufacturer so agrees. U.K.

2.5. The load/speed test programme must be carried out without interruption. U.K.

3. Equivalent test methods U.K.

If a method other than that described in section 2 is used, its equivalence must be demonstrated.

LOAD/SPEED TEST PROGRAMME
a ‘Special-use’ tyres (see section 2.1.3. of Annex II) should be tested at a speed equal to 85 % of the test-drum speed prescribed above for equivalent normal tyres.
Load index	Tyre speed category symbol	Test-drum speed (rev/min)a		Load placed on the wheel as a percentage of the load corresponding to the load index
		Radial-ply tyre	Diagonal (bias-ply) tyre	7 h.	16 h.	24 h.
122 or more	F	100	100	66 %	84 %	101 %
	G	125	100
	J	150	125
	K	175	150
	L	200	—
	M	225	—
121 or less	F	100	100
	G	125	125
	J	150	150
	K	175	175
	L	200	175	70 %	88 %	106 %
				4 h.	6 h.
	M	250	200	75 %	97 %	114 %
	N	275	—	75 %	97 %	114 %
	P	300	—	75 %	97 %	114 %

Appendix 8 VARIATION OF LOAD CAPACITY WITH SPEED

Commercial-vehicle tyres

RADIAL AND DIAGONAL

(see Annex II, sections 2.30, 2.31 and 6.2.4)

a The load capacity indices refer to single operations (see section 2.28.2 of Annex II).
b Load variations are not allowed above 160 km/h. For speed category symbols Q and above, the speed category corresponding to the speed category symbol (see section 2.29.3 of Annex II) specifies the maximum speed permitted for the tyre.
Speed(km/h)	Variation of load capacity (%)
	All load indices				Load indicesa≥ 122		Load indicesa≤ 121
	Speed category symbol				Speed category symbol		Speed category symbol
	F	G	J	K	L	M	L	M	N	Pb
0	+ 150	+ 150	+ 150	+ 150	+ 150	+ 150	+ 110	+ 110	+ 110	+ 110
5	+ 110	+ 110	+ 110	+ 110	+ 110	+ 110	+ 90	+ 90	+ 90	+ 90
10	+ 80	+ 80	+ 80	+ 80	+ 80	+ 80	+ 75	+ 75	+ 75	+ 75
15	+ 65	+ 65	+ 65	+ 65	+ 65	+ 65	+ 60	+ 60	+ 60	+ 60
20	+ 50	+ 50	+ 50	+ 50	+ 50	+ 50	+ 50	+ 50	+ 50	+ 50
25	+ 35	+ 35	+ 35	+ 35	+ 35	+ 35	+ 42	+ 42	+ 42	+ 42
30	+ 25	+ 25	+ 25	+ 25	+ 25	+ 25	+ 35	+ 35	+ 35	+ 35
35	+ 19	+ 19	+ 19	+ 19	+ 19	+ 19	+ 29	+ 29	+ 29	+ 29
40	+ 15	+ 15	+ 15	+ 15	+ 15	+ 15	+ 25	+ 25	+ 25	+ 25
45	+ 13	+ 13	+ 13	+ 13	+ 13	+ 13	+ 22	+ 22	+ 22	+ 22
50	+ 12	+ 12	+ 12	+ 12	+ 12	+ 12	+ 20	+ 20	+ 20	+ 20
55	+ 11	+ 11	+ 11	+ 11	+ 11	+ 11	+ 17,5	+ 17,5	+ 17,5	+ 17,5
60	+ 10	+ 10	+ 10	+ 10	+ 10	+ 10	+ 15,0	+ 15,0	+ 15,0	+ 15,0
65	+ 7,5	+ 8,5	+ 8,5	+ 8,5	+ 8,5	+ 8,5	+ 13,5	+ 13,5	+ 13,5	+ 13,5
70	+ 5,0	+ 7,0	+ 7,0	+ 7,0	+ 7,0	+ 7,0	+ 12,5	+ 12,5	+ 12,5	+ 12,5
75	+ 2,5	+ 5,5	+ 5,5	+ 5,5	+ 5,5	+ 5,5	+ 11,0	+ 11,0	+ 11,0	+ 11,0
80	0	+ 4,0	+ 4,0	+ 4,0	+ 4,0	+ 4,0	+ 10,0	+ 10,0	+ 10,0	+ 10,0
85	− 3	+ 2,0	+ 3,0	+ 3,0	+ 3,0	+ 3,0	+ 8,5	+ 8,5	+ 8,5	+ 8,5
90	− 6	0	+ 2,0	+ 2,0	+ 2,0	+ 2,0	+ 7,5	+ 7,5	+ 7,5	+ 7,5
95	− 10	− 2,5	+ 1,0	+ 1,0	+ 1,0	+ 1,0	+ 6,5	+ 6,5	+ 6,5	+ 6,5
100	− 15	− 5	0	0	0	0	+ 5,0	+ 5,0	+ 5,0	+ 5,0
105		− 8	− 2	0	0	0	+ 3,75	+ 3,75	+ 3,75	+ 3,75
110		− 13	− 4	0	0	0	+ 2,5	+ 2,5	+ 2,5	+ 2,5
115			− 7	− 3	0	0	+ 1,25	+ 1,25	+ 1,25	+ 1,25
120			− 12	− 7	0	0	0	0	0	0
125						0	− 2,5	0	0	0
130						0	− 5	0	0	0
135							− 7,5	− 2,5	0	0
140							− 10	− 5	0	0
145								− 7,5	− 2,5	0
150								− 10	− 5	0
155									− 7,5	− 2,5
160									− 10	− 5

(1)

See explanatory figure, Appendix 1.

(2)

See explanatory figure, Appendix 1.

(3)

See explanatory figure, Appendix 1.

(4)

Equivalence factor from inches to mm is 25,4.

(5)

In the case of passenger car tyres intended for vehicles designed for a maximum speed greater than 240 km/h (Z rated tyres), until uniform test procedures have been agreed the manufacturer of the tyre must satisfy the technical service that his test procedure and results are acceptable.

(6)

In the case of commercial vehicle tyres intended for vehicles designed for a maximum speed greater than 150 km/h, until uniform test procedures have been agreed the manufacturer of the tyre must satisfy the technical service that his test procedure and results are acceptable.