1993 Pontiac Bonneville Owner's Manual - Page 252

Don'tletanyonetell you that ,~ underinflation or overinflation all right. It's not. If your tires don't , 1\ ;1 ,%$: Tire lnspection and Rotation When to Check: Check your tiresonce a month or more. Don't forget your compact spare tire. It should be at 60 psi (420 kpa). To make your tires last longer, have them inspected and rotatedat the mileages recommendedin your Maintenance Schedule. See the Index under Scheduled MaintenanceServices. Use this rotationpattern. How to Check: rotated, adjust Use a good quality pocket-type gage to After the tires have been the front and rear inflation pressure as check tire pressure. Simply looking at shown on the Tire-Loading Information the tires will not tell the pressure, you label. Make certain that all wheel nuts especially if you have radial tiresare properly tightened. See the Index which may look properly inflated even if under Wheel Nut Torque. they're underinflated. If your tires have valve caps, be sure to put them back on. They help prevent leaks by keeping out dirt and moisture.