# Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance), Division 6: PROCEDURE FOR THE ALIGNMENT OF A CANDIDATE LABORATORY

Extent: E+W+S+N.I.

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 )

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/IVa/division/6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-IVa/division-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.