SAE J2452

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SAE J2452 is a standard defined by the Society of Automotive Engineers to define the rolling resistance of tires.

The rolling resistance coefficient (RRC) indicates the amount of force required to overcome the hysteresis of the material as the tire rolls. Tire pressure, vehicle weight and velocity all play a roll in how much force is lost to rolling resistance.

The basic model equation for SAE J2452 is:

Rolling_resistance ( N / Lbs) = P^alpha * Z^beta * (a + b*V + c*V*V)

Where:

P is the tire inflation pressure ( kPa / psi)

Z is the applied load for vehicle weight ( N /Lbs)

V is the vehicle speed ( kph / mph)

alpha, beta, a, b, c are the coefficients for the model.

The units of the coefficients are matched to the units used in the model, ie. ( metric / english)

This model is newer than SAE J1269 and provides more accuracy over a range of different vehicle loads(weight), tire pressures and vehicle speeds.