This report, on the effect of tread materials on tire performance, continues the study in Part I [1] on the analogous effects of cords. A new “deformation index” concept for the characterizing energy loss is proposed. Principles are developed for maximum correlation of this index to rolling resistance, wet and dry traction, ice traction, and cornering force. The deformation index is used to determine the dynamic property most relevant to each of these tire functions.

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