2004 Pontiac GTO Owner's Manual - Page 253

After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Tire and Loading Information label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" under Capacities and Specifications on page 5-92. {CAUTION: Rust or dirt on a wheel, or on the parts to which it is fastened, can make wheel nuts become loose after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all the rust or dirt off. See "Changing a Flat Tire" in the Index. If your vehicle has 235/40ZR18 tires, they must roll in a certain direction for the best overall performance. The direction is shown by an arrow on the tire sidewall. Because these tires are uni-directional, they should be rotated as shown here. These tires should only be moved from front to rear and rear to front on the same side of the vehicle. Don't include the compact spare tire in your tire rotation. 5-63