1995 Pontiac Grand Am Owner's Manual - Page 249

When it's Time New Tires for One way to tell when it's time for new tires is to check the treadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. Buying New Tires To find out what kind and size tires you need, look at of 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 get new tires, you get ones with that same TPC Spec number. way, That your vehicle will continue have tires that are designed to 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, theTPC number will be followed by an "MS" (for mud and snow). You need a new tire if 0 You can see the indicatorsat three or more places around the tire. YOU see cord or fabric showing through the tire's can rubber. The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. The tire has a bump, bulge or split. The tire has a puncture, cut,or other damage that can't be repaired well because of the size or location of the damage. 0 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. 6-38