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The free-rolling cornering, straight-line braking, and pull force properties of a small sample of tire specifications is examined. This is done to examine potential differences between the specifications and the statistics of force and moment measurements. Two steer axle specifications, two drive axle specifications, and a trailer specification are considered, In addition, the evolution of properties for one drive axle specification is followed from new to naturally worn-out to retreaded. The summarized data is available from SAE Cooperative Research on electronic media.

The large size of commercial highway vehicles can lead to significant problems in determining their inertial and suspension properties. New techniques and equipment used in the measurement of these properties have been developed and are discussed. Vertical spring deflection behavior, including coulomb friction, for the suspensions of a truck, tractor, and semitrailer are given.