1997 Pontiac Trans Sport Owner's Manual - Page 368

When It's Time for New Tires One way to tell when it's time for new tiresis to check the treadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. 0 The tire has a bump, bulgeor split. The tire has a puncture, cut or other damage that can't be repaired well because the size or location of of the damage. Buying New Tires To find out what kind and sizetires you need, look of at the Certification/Tirelabel. The tires installed on your vehicle when it new had was a Tire PerformanceCriteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that sameTPC Spec number. That way 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). 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 construction type (bias, and bias-belted or radial) as your original tires. You need a new tire if any of the following statements are true: You can see the indicators at three or more places around the tire. You can see cord or fabric showing through the tire's rubber. The tread or sidewall is cracked, cut or snagged deep enough to show cordor fabric. 6-43