owners manual Toyota 4Runner

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Uniform tire quality grading This information has been prepared in ac-Traction A, B, C—The traction grades,Warning: The temperature grades for this cordance with regulations issued by the from highest to lowest, are A, B, and C,tire are established for a tire that is proper- National Highway Traffic Safety Adminis-and they represent the tire’s ability to stoply inflated and not overloaded. Excessive tration of the U.S. Department of Trans- portation. It provides the purchasers and/on wet pavement as measured underspeed, underinflation, or excessive load- controlled conditions on specified govern-ing, wither separately or in combination, or prospective purchasers of Toyota ment test surfaces of asphalt can cause heat buildup and possible tireand con- vehicles with information on uniform tire quality grading. crete. A tire marked C may have poor trac-failure. tion performance. Your Toyota dealer will help answer any questions you may have as you read thisWarning: The traction grade assigned to information. this tire is based on braking (straight ahead) traction tests and does not include DOT quality grades—All passenger cornering (turning) traction. vehicle tires must conform to Federal Temperature A, B, C—The temperature Safety Requirements in addition to these grades. These quality grades aregrades are A (the highest), B, and C, rep- molded on the sidewall. resenting the tire’s resistance to the gen- eration of heat and its ability to dissipate Treadwear—The treadwear grade is a heat when tested under controlled condi- comparative rating based on the wear tions on a specific indoor laboratory test rate of the tire when tested under con- wheel. Sustained high temperature can trolled conditions on a specified govern- cause the material of the tire life, and ex- ment test course. For example, a tire cessive temperature can lead to sudden graded 150 would wear one and a half tire failure. The grade C corresponds to a (1-1/2) times as well on the government course as a tire graded 100. The relative level of performance which all passenger car tires must meet under the Federal Mo- performance of tires depends upon the tor Vehicle Safety Standard No. 109. actual conditions of their use, however, Grades B and A represent higher levels of and may depart significantly from the performance on the laboratory test wheel norm due to variations in driving habits, service practices and differences in road than the minimum required by law. characteristics and climate. 226

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