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[F1 ANNEX IVa U.K. Laboratory alignment procedure for the measurement of rolling resistance

Textual Amendments

F1 Inserted by Commission Regulation (EU) No 1235/2011 of 29 November 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip grading of tyres, the measurement of rolling resistance and the verification procedure (Text with EEA relevance).

6. PROCEDURE FOR THE ALIGNMENT OF A CANDIDATE LABORATORY U.K.

One reference laboratory ( l ) of the network shall calculate the linear regression function of the candidate laboratory ( c ), A2 _c and B2 _c , as follows:

RRC _m,l = A2 _c × RRC _m,c + B2 _c

where:

RRC _m,l

is the measured value of the rolling resistance coefficient by the reference laboratory ( l ) (including temperature and drum diameter corrections)

RRC _m,c

is the measured value of the rolling resistance coefficient by the candidate laboratory ( c ) (including temperature and drum diameter corrections)

The aligned RRC of tyres tested by the candidate laboratory is calculated as follows:

RRC = (A1 _l × A2 _c ) × RRC _m,c + (A1 _l × B2 _c + B1 _l )]