owners manual Volvo XC60

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08 Wheels and tires Uniform Tire Quality Grading Quality grading information test surfaces of asphalt and concrete. A tire WARNING marked C may have poor traction perform- ALL PASSENGER VEHICLE TIRES MUST The temperature grade for this tire is ance. The traction grade assigned to this tire CONFORM TO FEDERAL SAFETY established for a tire that is properly infla- is based on braking (straight-ahead) traction REQUIREMENTS IN ADDITION TO THESE ted and not overloaded. Excessive speed, tests and is not a measure of cornering (turn- GRADES under-inflation, or excessive loading, either ing) traction. separately or in combination, can cause Quality grades can be found, where appli- heat buildup and tire failure. cable, on the tire sidewall between the WARNING tread shoulder and maximum section width. For example: The traction grade assigned to this tire is based on braking (straight-ahead) traction Treadwear 200 Traction AA Temperature A tests and is not a measure of cornering (turning) traction. TREADWEAR The treadwear grade is a comparative rating TEMPERATURE based on the wear rate of the tire when tes- The temperature grades are A (the highest), ted under controlled conditions on a specified B, and C, representing the tire's resistance to government test course. For example, a tire the generation of heat and its ability to dissi- graded 150 would wear one and one half pate heat when tested under controlled con- (1 1/2) times as well on the government ditions on a specified indoor laboratory test course as a tire graded 100. The relative per- wheel. Sustained high temperature can cause formance of tires depends upon the actual the material of the tire to degenerate and conditions of their use, however, and many reduce tire life, and excessive temperature depart significantly from the norm due to var- can lead to sudden tire failure. The grade C iation in driving habits, maintenance practices corresponds to a minimum level of perform- and differences in road characteristics and ance that all passenger vehicle tires must climate. meet under the Federal Motor Safety Stand- TRACTION ard No. 109. Grades B and A represent higher The traction grades, from highest to lowest,levels of performance on the laboratory test 08 are AA, A, B, and C, as measured under con-wheel than the minimum required by law. trolled conditions on specified government 309

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