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A newly designed and built Mobile Tire Testing Machine (MTTM) is described that has features for large and continuously variable camber and steering angles with minimum tire scrub. This equipment was used to examine tire properties for six passenger car tires. Of special interest were the tire characteristics at combinations of high slip and camber angle. It was found that camber stiffness decreases with increasing slip angle when the slip and camber angles are both positive, and at limit conditions in slip angle, cambering a tire has little effect on the lateral side force produced. When the slip angle is negative, and the camber angle is positive, preliminary data shows that a greater lateral force is produced when compared to operating at limit conditions in slip angle alone.

A Mobile Tire Testing Machine (MTTM) was designed and built with several unique features. This machine measures forces and moments of passenger car and smaller tires throughout large ranges of parameters. It can steer and camber up to 45 degrees, test on any surface, and continuously steer and camber without tire scrub. This last feature benefits acquisition of transient tire data since any external forces due to tire scrub are minimized. Typical passenger car tire test results are presented along with tests conducted at camber angles up to 25 degrees where the cornering force due to the camber angle offsets the cornering force due to slip angle. Trends noted in these high camber angle tests are discussed.