The general trend of the forces generated by a nonuniform tire and wheel as a function of speed has been available for several years. As a rule it has been found that the first harmonic of the force variation is the greatest single contributory factor in those vehicle shake problems originating at the tire and wheel. The paper shows how the first harmonic varies with speed for a batch of tires, and, in particular, discusses the phase and amplitude relationship between longitudinal force variation and radial force variation with speed; a mathematical analysis is given. Attempts to counteract the high speed nonuniformity forces by using balance weights on the wheel are reported. The relative effect of the tire and the wheel is considered. Also, the application of this work as a vehicle shake diagnostic technique to isolate tire wheel assembly and vehicle effects is discussed.

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