SAE J1269

SAE J1269 is a standard test defined by the Society of Automotive Engineers^[1] to measure the rolling resistance of tires under conditions of thermal equilibrium.^[2][3] SAE J2452 is an alternative procedure for measuring rolling resistance under conditions similar to a vehicle coastdown event, where the tire is in a roughly isothermal condition (but not thermal equilibrium).

SAE J1269

Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires
SAE J1269 and SAE J2452 performed on new tires.
Status	Published
Year started	1979 (1979)
Latest version	202012 December 22, 2020 (2020-12-22)
Organization	SAE International
Committee	Highway Tire Committee
Related standards	SAE J2452, ISO 28580

The rolling resistance coefficient (RRC) thus measured indicates the proportion of energy that is lost to the hysteresis of the material as the tire rolls.