The effects of making tread life evaluations using different patterns of rotation are reported. It is shown that the estimated average tread life for a tire was not statistically different in experiments with four tires in fixed wheel position, on fixed axles, or fully rotated to all wheel positions. The fully rotated procedure produced the same average for a pair of tires or for four tires; the variability of the data was significantly smaller than in the other rotation patterns.

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