owners manual Subaru Forester

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13-12 Consumer information and Reporting safety defects Uniform tire quality grading Treadwear standards The treadwear grade is a comparativeThe traction grade assigned to rating based on the wear rate of thethis tire is based on straight- This information indicates the relativetire when tested under controlled con-ahead braking traction tests, performance of passenger car tires inditions on a specified government testand does not include accelera- the area of treadwear, traction, andcourse.tion, cornering, hydroplaning, or temperature resistance. This is to aidFor example, a tire graded 150 wouldpeak traction characteristics. the consumer in making an informedwear one and one-half (1-1/2) times choice in the purchase of tires.as well on the government course as Quality grades can be found wherea tire graded 100. The relative perfor-Temperature A, B, C applicable on the tire sidewall be-mance of tires depends upon the ac-The temperature grades are A (the tween tread shoulder and maximumtual conditions of their use, however,highest), B, and C, representing the section width. For example:and may depart significantly from thetire’s resistance to the generation of Treadwear 200 Traction AA Tem-norm due to variations in driving hab-heat and its ability to dissipate heat perature A its, service practices and differenceswhen tested under controlled condi- in road characteristics and climate.tions on a specified indoor laboratory The quality grades apply to new pneu-test wheel. Sustained high tempera- matic tires for use on passenger cars.Traction AA, A, B, Cture can cause the material of the tire However, they do not apply to deepThe traction grades, from highest toto degenerate and reduce tire life, and tread, winter type snow tires, space-lowest, are AA, A, B and C. Thoseexcessive temperature can lead to saver or temporary use spare tires,grades represent the tire’s ability tosudden tire failure. The grade C corre- tires with nominal rim diameters of 12stop on wet pavement as measuredsponds to a level of performance inches or less, or to some limited pro-under controlled conditions on speci-which all passenger car tires must duction tires. fied government test surfaces of as-meet under the Federal Motor Vehicle All passenger car tires must confirmphalt and concrete. A tire marked CSafety Standards No. 109. Grades B to Federal Safety Requirements inmay have poor traction performance.and A represent higher levels of per- addition to these grades. formance on the laboratory test wheel than the minimum required by law.

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