ANNEX II Requirements for tyres with regard to wet grip, rolling resistance and rolling noise
PART A —WET GRIP REQUIREMENTS
Class C1 tyres shall meet the following requirements:
| Category of use | Wet grip index (G) |
|---|---|
| snow tyre with a speed symbol (‘Q’ or below, excluding ‘H’) indicating a maximum permissible speed not greater than 160 km/h | ≥ 0,9 |
| snow tyre with a speed symbol (‘R’ and above, including ‘H’) indicating a maximum permissible speed greater than 160 km/h | ≥ 1,0 |
| normal (road type) tyre | ≥ 1,1 |
PART B —ROLLING RESISTANCE REQUIREMENTS
The maximum values for the rolling resistance coefficient for each tyre type, measured in accordance with ISO 28580, shall not exceed the following:
Table 1
| Tyre class | Max value (kg/tonne)1st stage |
|---|---|
| C1 | 12,0 |
| C2 | 10,5 |
| C3 | 8,0 |
Table 2
| Tyre class | Max value (kg/tonne)2nd stage |
|---|---|
| C1 | 10,5 |
| C2 | 9,0 |
| C3 | 6,5 |
For snow tyres, the limits in Table 2 shall be increased by 1 kg/tonne.
PART C —ROLLING NOISE REQUIREMENTS
1.The noise levels determined in accordance with the procedure specified in the implementing measures to this Regulation shall not exceed the limits designated in points 1.1 or 1.2. The Tables in points 1.1 and 1.2 represent the measured values corrected for temperature, except in the case of C3 tyres, and instrument tolerance, and are rounded down to the nearest whole value.
1.1.Class C1 tyres, with reference to the nominal section width of the tyre that has been tested:
| Tyre class | Nominal section width (mm) | Limit values in dB(A) |
|---|---|---|
| C1A | ≤ 185 | 70 |
| C1B | > 185 ≤ 215 | 71 |
| C1C | > 215 ≤ 245 | 71 |
| C1D | > 245 ≤ 275 | 72 |
| C1E | > 275 | 74 |
For snow tyres, extra load tyres or reinforced tyres, or any combination of these classifications, the above limits shall be increased by 1 dB(A).
1.2.Class C2 and C3 tyres, with reference to the category of use of the range of tyres:
| Tyre class | Category of use | Limit values in dB(A) |
|---|---|---|
| C2 | Normal tyres | 72 |
| Traction tyres | 73 | |
| C3 | Normal tyres | 73 |
| Traction tyres | 75 |
For special use tyres, the above limits shall be increased by 2 dB(A). An additional 2 dB(A) shall be allowed for snow tyres in the C2 traction tyre category. For all other categories of C2 and C3 tyres, an additional 1 dB(A) shall be allowed for snow tyres.