1998 Pontiac Grand Am Owner's Manual - Page 278

When It's Time for New Tires 0 The tire has a bump, bulge or split. 0 The tire has a puncture, cut or other damage that One way to tell when it's can't be repaired well because of the size or location time fornew tires is to of the damage. check the treadwear indicators, which will Buying New Tires appear when your tires have To find out what kind and of tires you need, look at size mm) or only 1/16 inch (1.6 the Tire-Loading Information label. less of tread remaining. The tires installed on your vehicle when new had it was (TPC Spec) a Tire Performance Criteria Specification number on each tire's sidewall. When you new tires, get get ones with that same TPC Spec number. That way to are your vehicle will continue have tires that designed to give proper endurance, handling, speed rating, You need a new tire if any of the following statements traction, ride and other things during normal service on are true: an your vehicle.If your tires have all-season tread design, the TPC number will be followed an "MS" by 0 You can see the indicators at three or more places (for mud and snow). around the tire. If you ever replace your tires with those not having a 0 You can see cordor fabric showing through the TPC Spec number, make they are the same size, sure tire's rubber. load range, speed rating and construction type (bias, 0 The tread or sidewall is cracked, cut snagged deep or original tires. bias-belted or radial) as your enough to show cord or fabric. 6-45