1998 Cadillac Seville Owner's Manual - Page 321

A CAUTIL I: Mixing tires could cause you lose control while to driving. If you mixtires of different sizes or types (radial andbias-belted tires),the vehicle may not a handle properly, and you could have crash. Using tires of different sizes may also cause damage to your vehicle. Be sure to usethe same size and type tires on all wheels. It's all right to drive with your compact spare, though. It was developed for use onyour vehicle. Uniform Tire Quality Grading The following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in United States.) The the the grades are molded on sidewalls of most passenger car tires. The Uniform Tire Quality Grading system does not apply to deep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diametersof 10 to 12 inches (25 to 30 cm), or to some limited-production tires. While the tires available on General Motors passenger cars and light trucks may vary with respect to these grades, they must also conform to Federal safety requirements and additional General Motors Tire Performance Criteria (TPC) standards. I A CAUTION: If you use bias-plytires on your vehicle, the wheel rim flanges could develop cracks after many milesof driving. A tire and/or wheel could fail suddenly, causinga crash. Use only radial-ply tires with the wheels onyour vehicle. 6-46