1994 Oldsmobile Bravada Owner's Manual - Page 194

Service & Appearance Care The tire has a puncture, cut,or other damage that can't be repaired well because of the size orlocation of the damage. as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly fromthe norm due to variations in driving habits, service practicesand differences in road characteristics and climate. Traction A, B, C The traction grades, from highestto lowest are: A, B, and C. They represent the tire's ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poortraction performance. Warning: The traction grade assigned to this tire is based on braking(straightahead) traction tests and does not include cornering (turning) traction. Temperature A, B, C The temperature grades are A (the highest), B, and C, representing the tire's resistance to thegeneration of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high Buying New Tires To find out what kind and size of tires you need, look at the Certificationnire label. The tires installed on your vehicle when a it was new had Tire Performance Criteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that same TPC Spec number. That way, your vehicle willcontinue to have tires that are designed to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle.If your tires have an allseason tread design, the TPC number will be followed by a "MS" (for mud and snow). If you ever replace your with those tires not having a TPC Spec number, make sure they are thesame size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires. - Uniform Tire Qualify Grading The following informationrelates to the system developedby the United States National Highway Traffic Safety Administration which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles soldin the United States.) Treadwear The treadwear grade isa comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example, a tire graded 150 would wear one and a half (1 1/2) times as well on the government course - 188