Parameters Influencing Tire Rolling Resistance and the New ISO Standard

The key to understanding the tire's influence on vehicle fuel economy is through tire Rolling Resistance. In the current practice, the tire's rolling resistance is measured under controlled conditions, yet there are several parameters that influence rolling resistance. Particularly Pressure, Load, Speed, Temperature and Surface Condition are discussed and examined, however the machine itself contributes greatly to the actual value of measured rolling resistance. The new ISO standard is discussed and how it will be used to reduce variations in Rolling Resistance measurement from machine to machine. In this way, tire rolling resistance measurements - through a single point test and a measurement result correlation method, can be used to help facilitate inter-laboratory agreement.