1995 Pontiac Grand Prix Owner's Manual - Page 262

When rotating your tires, always use thecorrect rotation pattern shown here. Don't include the compact spare tire in your tire rotation. After the tires have been rotated, adjust the front and rear inflation pressures as shown onthe Tire-Loading Information label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" inthe Index. When It's Time forNew Tires 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. .. . You need a new tire if You can see the indicators at three or more places around thetire. 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 cord or fabric. The tire has a bump, bulge or split. 0 The tire has a puncture, cut, or other damage that can't be repaired well because of the size or location of the damage. 6-49