1998 Cadillac DeVille Owner's Manual - Page 332

'A Uniform Tire Quality Grading CAUTION: Mixing tires could causeyou to lose control while driving. I you mix tires of different sizes or types f (radial andbias-belted tires), thevehicle may not handle properly, and you could havea crash. Using tires of different sizes may also cause damage to your vehicle. Be sure touse the same size and type tires on all wheels. It's all right to drive with your compactspare, though. It was developed for use on your vehicle. The following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by (This treadwear, traction and temperature performance. applies only to vehicles sold in the United States.) The grades are molded on the sidewalls most passenger of car tires. The Uniform Tire Quality Grading system does not apply todeep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 10 to 12 inches (25 to 30 cm), or to some limited-production tires. While the tires available General Motors passenger on 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 ("PC)standards. If you use bias-ply tires on your vehicle, the wheel rim flanges could develop cracks after many miles of driving. A tire and/or wheel could fail suddenly, causing crash. Use only radial-ply a tires with the wheels on yourvehicle. 6-45