1997 Pontiac Grand Prix Owner's Manual - Page 320

g New Tires To find out what kind and size of tires you need, look at the Tire-Loading Information label. The tires installed on your vehicle when it was new had a Tire Performance Criteria Specification (TPC Spec) number on eachtire's sidewall. When you get new tires, get ones with that sarne TPC Specnumber. That way your vehicle will continue tohave tires that are designed 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 be followed by an "MS" I (for mud and snow). If you ever replace your tires with those not having a 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. Reset Tire Inflation Monitor (TIM). Mixing tires could cause to lose control while you driving. If you mix tires of different sizes or types tires), the vehicle may not (radial and bias-belted handle properly, and could havea crash. you Using tires of different sizes may also cause damage to your vehicle. Be sure to use the same on size and type tires all wheels. It's all right to drive with your compact spare, though. It was developed for useon your vehicle. 6-50