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This paper reviews the practical knowledge of tire to road friction relative to the tire tread pattern, tread compound and road surface condition. The paper then discusses the influence on tire wet roadhold performance of unevenly worn tires and shows that this condition can lead to performance changes not predictable from the more normally reported evenly worn tire condition. The paper includes results for truck tires in addition to car tires and suggests that continued improvements in the new tire wet roadhold performance will only increase the difference between the new tire and the tire worn to the legal minimum tread depth.
tire, traction, roadhold, wet conditions
Director, Tire Research, S. P. Tire, U.K. Ltd., Erdington, Birmingham