Division (b) ASTM E 1136 Standard Reference Test Tyre (SRTT14″) methodF1

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″ ^f1 .

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.