1998 Buick Skylark Owner's Manual - Page 265

I When It's Time for New Tires The tire has a bump, bulge split. or The tire has a puncture, cut or other damage that One way to tell when it's can't be repaired well because the size or location of time for new tires to is of the damage. check the treadwear indicators, which will Buying New Tires appear when your tires have To find out what kind and sizetires you need, look at of only 1/16 inch (1.6 mm) or the Tire-Loading Information label. less of tread remaining. The tires installed on your vehicle when new had it was 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 are designed to to give proper endurance, handling, speed rating, of You need a new tire if any the following statements traction, ride and other things during normal service on are true: your vehicle.If your tires have an all-season tread "MS" design, the TPC number will be followed by an 0 You can see the indicators at three or more places (for mud and snow). around the tire. You can see cord or fabric showing through the tire's rubber. 0 The tread or sidewallis cracked, cut or snagged deep enough to show cord or fabric. 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. 6-42