ISの取扱説明書・マニュアル [全25ページ 0.26MB]
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3916-1. Specifications6Vehicle specificationsn TreadwearThe treadwear grade is a comparative rating based on the wear rate ofthe tire when tested under controlled conditions on a specified gov-ernment test course.For example, a tire graded 150 would wear one and a half (1 - 1/2) times aswell on the government course as a tire graded 100.The relative performance of tires de pends upon the actual conditions oftheir use, however, and may depart significantly from the norm due to varia-tions in driving habits, service practices and differences in road characteris-tics and climate.n Traction AA, A, B, CThe traction grades, from highest to lowest, are AA, A, B and C, andthey represent the tire's ability to stop on wet pavement as measuredunder controlled conditions on specified government test surfaces ofasphalt and concrete.A tire marked C may have poor traction performance.Warning: The traction grade assigned to this tire is based on braking(straight ahead) traction tests and does not include cornering (turning) trac-tion.n Temperature A, B, CThe temperature grades are A (the highest), B, and C, representingthe tire's resistance to the generation of heat and its ability to dissipateheat when tested under controlled conditions on a specified indoorlaboratory test wheel.Sustained high temperature can cause the material of the tire to degenerateand reduce tire life, and excessive temperature can lead to sudden tire fail-ure.The grade C corresponds to a level of performance which all passenger cartires must meet under the Federal Mo tor Vehicle Safety Standard No. 109.Grades B and A represent higher levels of performance on the laboratorytest wheel than the minimum required by law.
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