1997 Pontiac Grand Am Owner's Manual - Page 270

When to i- -- ~ Check yourtires once a month or more. Don't forget your compact spare tire. It should be at 60 psi (420 P a ) . 0 How to Check Use a goodquality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they're underinflated. Be sureto put the valve caps back on the valve stems. .They help prevent leaks by keeping out dirt and moisture. I When rotating your tires, always use the correct rotation pattern shown here. Don't include the compact spare tire your tire rotation. in After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Tire-Loading Information label. Make certain that all wheel nuts are properly tightened. See "Wheel Nut Torque" in the Index. Tire Inspectionand Rotation Tires shouldbe rotated every 6,000 to 8,000 miles (10 000 to 13 000 km). Any time you notice unusual wear, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See "When It's Time New Tires" and "Wheel for Replacement" later in this section for more information. The purpose of 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'' the Index for scheduled in rotation intervals. 6-43