1998 Pontiac Firebird Owner's Manual - Page 302

Buying New Tires To find out what kind and of tires you need, look at size the Tire-Loading Information label. The tires installed on your vehicle when was new had it a 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 will continue have tires that designed to are to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle.If your tires have an all-season tread design, the TPC number will followed by an "MS" be (for mud and snow). If you ever replace your tires with those having a not A CAUTION: Mixing tires could cause you to lose control while driving. If you mix tires of different sizes or types (radial and bias-belted tires), the vehicle may not handle properly, and could have a crash. you Using tires of different sizesmay also cause damage to your vehicle. Be sure to use the same size and type tires all wheels. on It's all right to drive with your compact spare, though. It was developed for use on your vehicle. TPC Spec number, make sure they are the same size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires. ' A, CAUTION: I you use bias-ply tires on your vehicle, the f wheel rim flanges could develop cracks after many miles of driving. A tire and/orwheel could fail suddenly, causing a crash. only radial-ply Use tires with the wheels on yourvehicle. 6-49