1998 GMC Suburban Owner's Manual - Page 338

The purposeof regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. See "Scheduled Maintenance Services" in the Index for scheduled rotation intervals. FRT After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Certification/Tire label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" in the Index. When rotating your tires, always use one of the correct rotation patterns shown here. Rust or dirt a wheel, or on the parts to which on it is fastened, can make wheel nuts becomeloose after a time. The wheel could come off and cause an accident. Whenyou change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In anemergency, you can use a cloth or a paper towel to do this; but be sure touse a scraper or wire brush later,if you need to, to get all the rust or dirt (See off. "Changing a Flat Tire" in the Index.) 6-46