1998 Pontiac Firebird Owner's Manual - Page 299

When to Check Check your tires once a month more. or Don't forget your compact spare tire. It should be at 60 psi (420 P a ) . Tire Inspection and Rotation Tires shouldbe rotated every6,000 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 for New Tires" and "Wheel Replacement" later in this section for more information. The purpose of regular rotationis to achieve more uniform wearfor all tires on vehicle. The first the rotation is the most important. See "Scheduled Maintenance Services'' the Index for scheduled in rotation intervals. How to Check Use a good quality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply bylooking 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 outd r it and moisture. 6-46