1993 Buick Roadmaster Owner's Manual - Page 276

After the tires havebeers rotated, adjustthe front and r e a inflation pressureas shown on the Tire-Loading Information label. Make certain that all wheel nuts ax9 properly tightened. See "Wheel Nut Torque" in the Index. When It's Time for New Tires .. ' A CAUTION: Rust or diir on a wheel, or on the parts to which it is fastened, can make wheelnuts become loose after a time. The wheel-could come off 'and cause an accident. When change a you places wheel, remove any rust or dirt from where the wheel attaches to the vehicle. In an emergency, you can use a'cloth or a papertowel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all therust dirt off. (See "Changing a Flat Tire" in the Index.) I I I One way to tell when it's time for new tires to. is check the treadwear'- * . indicators, which will appear when your tires have only 2/32 inch (1.6 mm) or less of tread remaining. ' '. -- DU need a new tire if You can seethe indicators at three places around the tire. You can see cord or fabric showing through tire's the rubber. The tread or sidewall cracked, cut-orsnagged deep is enough to show cord or fabric. The tire has a bump, bulge or .split. 274