1996 Chevrolet Blazer Owner's Manual - Page 293

While the tires available on General Motors passenger cars and light trucks may vary withrespect to these grades, they must also conform to Federal safety requirements and additional General Motors Tire Mixing tires could cause you to lose control while Performance Criteria (TPC) standards. of driving. If you mix tires different sizes or types Treadwear (radial and bias-belted tires), the vehicle may not handle properly, and you could have crash. a The treadwear grade is a comparativerating based on also cause Using tires of different sizes may the wear rate of the tire when tested under controlled damage to your vehicle.Be sure to use the same conditions on a specified government test course. For example, atire graded 150 would wear one and a half on size and type tires all wheels. (1 1/2) times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and Uniform Tire Quality Grading may depart significantly from the norm due to variations The following information relates to the system in driving habits, service practices and differences in developed by the United States National Highway road characteristics and climate. Traffic Safety Administration,which grades tires by treadwear, traction and temperature performance. (This Traction A, B, C applies only to vehicles sold in the United States.) The The traction grades, from highest to lowest, are A, B, grades are molded on the sidewalls of most passenger and C, and they represent the tire's ability to stop car tires. The Uniform Tire Quality Grading system does on wet pavement as measured under controlled not apply to deep tread, winter-type snow tires, conditions on specified government test surfaces space-saver ortemporary use spare tires, tires with of asphalt and concrete. A tire marked C may have nominal rim diameters of 10 to 12 inches (25to 30 cm), poor traction performance. or to some limited-production tires. - 6-45