owners manual Volvo XC70

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09 Wheels and tires 09 side B-pillar and in the tire inflation tableTire specifications – Uniform Tireance. The traction grade assigned to this tire in this chapter. is based on braking (straight-ahead) traction Quality Grading tests and is not a measure of cornering (turn- • Cold tires: The tires are considered to beALL PASSENGER VEHICLE TIRES MUST ing) traction. cold when they have the same tempera- CONFORM TO FEDERAL SAFETY ture as the surrounding (ambient) air. This REQUIREMENTS IN ADDITION TO THESE temperature is normally reached after the WARNING GRADES. vehicle has been parked for at least The traction grade assigned to this tire is 3 hours. Quality grades can be found, where appli- based on braking (straight-ahead) traction cable, on the tire sidewall between the tests and is not a measure of cornering tread shoulder and maximum section (turning) traction. width. For example: Treadwear 200 Traction AA Temperature A TEMPERATURE The temperature grades are A (the highest), TREADWEAR B, and C, representing the tire's resistance to The treadwear grade is a comparative rating the generation of heat and its ability to dissi- based on the wear rate of the tire when tes- pate heat when tested under controlled con- ted under controlled conditions on a specified ditions on a specified indoor laboratory test government test course. For example, a tire wheel. Sustained high temperature can cause graded 150 would wear one and one half the material of the tire to degenerate and (1 ½) times as well on the government course reduce tire life, and excessive temperature as a tire graded 100. The relative perform- can lead to sudden tire failure. The grade C ance of tires depends upon the actual condi- corresponds to a minimum level of perform- tions of their use, however, and many depart ance that all passenger vehicle tires must significantly from the norm due to variation in meet under the Federal Motor Safety Stand- driving habits, maintenance practices and dif- ard No. 109. Grades B and A represent higher ferences in road characteristics and climate. levels of performance on the laboratory test wheel than the minimum required by law. TRACTION The traction grades, from highest to lowest, are AA, A, B, and C, as measured under con- trolled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poor traction perform- }} 303

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