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Tire treadwear is a very complicated phenomenon that is influenced by various factors. Any quantitative treadwear estimating method applicable to tires on a vehicle has not yet been established. In this study the effects of acting force to the tire and tire attitude (dynamic wheel alignment) upon treadwear were made clear experimentally by taking notice of the fact that they are only the factors directly influencing tire treadwear provided that a tire and a road surface are determined. Furthermore, on the assumption that treadwear will increase linearly, an examination was made to find a method of estimating treadwear of tires on any vehicle in any running condition by using above-mentioned effects for the values of tire-acting force and dynamic wheel alignment calculated from the vehicle particular and running condition.