1994 Oldsmobile Achieva Owner's Manual - Page 200

Service & Appearance Care test course. For example, atire graded 150 would wear one and a half (1%) times as well on thegovernment course as a tire graded 100. The relative performance of tires depends upon the Buying New Tires actual conditions of their use, however, To find out what kind and size of tires and may depart significantly fromthe you need, look at theTire-Loading norm due tovariations in driving habits, Information label. service practices and differences in road characteristics and climate. The tires installed on your vehiclewhen it was new had a Tire Performance Traction-A, B, C Criteria Specification (TPCSpec) The traction grades, from highestto number on each tire's sidewall. When lowest are: A, B, and C. Theyrepresent you get newtires, get ones with that the tire's abilityto stop on wet same TPCSpec number. That way, your pavement as measured under controlled vehicle willcontinue to have tires that conditions on specified governmenttest Uniform TireQualify Grading are designed to give proper endurance, surfaces of asphalt and concrete. A tire handling, speedrating, traction, ride The following information relates to the marked Cmay have poortraction and other things during normal service system developedby the United States performance. on your vehicle.If your tires have an all- National Highway Traffic Safety Warning: The traction grade assignedto season tread design, the TPC number Administration which gradestires by this tire is based on braking (straightwill be followed bya "MS" (for mud treadwear, traction and temperature ahead) traction tests and does not and snow). performance. (This applies only to include cornering (turning) traction. If you ever replace your with those vehicles sold in theUnited States.) tires Temperature-A, B, C not having a TPC Spec number, make Treadwear sure they are the same size, load range, The temperature grades are A (the The treadwear grade is a comparative speed rating and construction type highest), B, and C, representing the rating based on the wear rate of the tire (bias, bias-belted orradial) as your tire's resistance to thegeneration of when tested under controlled original tires. heat and its ability to dissipate heat conditions on a specified government The tire has a puncture, cut, or other damage that can't berepaired well because of the size or location of the damage.