1998 Pontiac Bonneville Owner's Manual - Page 296

Uniform Tire Quality Grading Mixing tires could cause to lose control while you driving. If you mix tires of different sizes or types (radial and bias-belted tires), the vehicle may not handle properly, and you could havea crash. Using tires of different sizes may also cause damage to your vehicle. Be to use the same sure size and type tires on all wheels. It's all right drive with your compact spare, to though. It was developed for use on your vehicle. The following information relates to the system developed by the UnitedStates National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold the United States.) The in grades are molded on the sidewalls most passenger of car tires. The Uniform Tire Quality Grading system doe not apply to deep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of 10 to 12 inches (25 30 cm), to or to some limited-production tires. While the tires available on General Motors passenger trucks may vary with respect to these cars and light grades, theymust also conform to Federal safety requirements and additional General Motors Tire Performance Criteria ( P C ) 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, causing a crash. Use only radial-ply tires with the wheels on your vehicle. 6-45