# 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 (b): ASTM E 1136 Standard Reference Test Tyre (SRTT14″) method

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

By derogation with point (4) of section 2, this method uses the reference tyre that has the characteristics indicated in ASTM E 1136-93 (Reapproved 2003) and referred to as SRTT14″ .
The average peak braking force coefficient ( μ peak,ave ) of the SRTT14″ shall be 0,7 ± 0,1 at 65 km/h.
The average peak braking force coefficient ( μ peak,ave ) of the SRTT14″ shall be corrected by the wetted road surface temperature as follows:
peak braking force coefficient ( μ peak,ave ) = peak braking force coefficient (measured) + temperature correction
temperature correction = 0,0035 × ( t – 20)
where t is the wetted road surface temperature in degrees Celsius.

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Source: https://www.legislation.gov.uk/eur/2009/1222/annex/V/division/3/division/3.2/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-1222/annex-V/division-3/division-3.2/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.