The force, torque, and power methods of measurement are all in common use and should yield the same test results. Effects of steering, traction, surface texture, and non-steady-state tire operations are excluded from the recommended practice because they are still in the research stage.
SAE J1270-2000 history
2017SAE J1270-2017 Measurement of Passenger Car@ Light Truck@ and Highway Truck and Bus Tire Rolling Resistance
2006SAE J1270-2006 Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance
2000SAE J1270-2000 Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance
1987SAE J1270-1987 Measurement of Passenger Car, Light Truck, and Highway Truck and Bus Tire Rolling Resistance R(2000)
1985SAE J1270-1985 The Measurement of Passenger Car and Light Truck Rolling Resistance
1984SAE J1270-1984 The Measurement of Passenger Car Tire Rolling Resistance