owners manual Saab 9-3

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Car care 219 Uniform Tire Quality Grading (US)Traction Temperature Quality grades can be found where applica-The traction grades, from highest to lowest, The temperature grades are A (the highest), ble on the tire sidewall between tread shoul-are AA, A, B and C. These grades represent B, and C, representing the tire’s resistance der and maximum section width. For exam-the tire’s ability to stop on wet pavement as to the generation of heat and its ability to dis- ple: measured under controlled conditions on sipate heat when tested under controlled Treadwear 200 Traction AA specified government test surfaces of conditions on a specified indoor laboratory Temperature A asphalt and concrete. A tire marked C may test wheel. Sustained high temperature can Treadwear have poor traction performance.cause the material of the tire to degenerate The treadwear grade is a comparative and reduce tire life. Excessive temperature rating based on the wear rate of the tire WARNING can lead to sudden tire failure. The grade C when tested under controlled conditions on corresponds to a level of performance a specified government test course. For The traction grade assigned to a tire is which all passenger car tires must meet example, a tire graded 150 would wear one based on straight-ahead braking, traction under the Federal Motor Vehicle Safety and one half (1 1/2) times as well on the gov-test and does not include acceleration, Standard No. 109. ernment course as a tire graded 100. The cornering, hydroplaning or peak traction Grades B and A represent higher levels of relative performance of tires depends upon characteristics.performance on the laboratory test wheel the actual conditions of their use, however, than the minimum required by law. and may depart significantly from the norm WARNING due to variations in driving habits, service practices and differences in road character- The temperature grade for a tire is estab- istics and climate. lished for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire fail- ure.

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