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From an observation of the ways in which pneumatic-tire treads wear in service, it appears that the movement of the tread when in contact with the road is probably an important cause of wear. In this paper two methods are described for recording tread movements as a tire rolls along under load. One way, which is rcferred to as the wax-plate method, is particularly adapted t o this work because the t read movements can be recorded quickly and easily with very simple equipment. The results of several tests by this method arc shown, and some of the factors in tire construction and operation which affect tread movements are determined . Methods for the reduction of this tread movement are suggested which should have a d irect bearing on the reduction of tread wear.

Measurement of the tread movement of pneumatic tires and a discussion of the probable relation to tread wear