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1998 Buick Riviera Owner's Manual

1998 Buick Riviera Owner's Manual

1998 Buick Riviera Owner's Manual

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TreadwearThe treadwear grade is a comparative rating based onthe wear rate of the tire when tested under controlledconditions on a specified government test course.For example, a tire graded 150 would wear one and ahalf (1 1/2) times as well on the government courseas a tire graded 100. The relative performance oftires depends upon the actual conditions of their use,however, and may depart significantly from the normdue to variations in driving habits, service practices anddifferences in road characteristics and climate.-- A, B, C'1'1 traction grades, from highest to lowest, are A, B,and C, and they represent the tire's ability to stop onwet pavement as measured under controlled conditionson specified government test surfaces of asphalt andconcrete. A tire marked C may have poor tractionperformance.Warning: The traction grade assigned to this tire is basedon braking (straight ahead) traction tests and does notinclude cornering (turning) traction.6-44

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