2003 Pontiac Bonneville Owner's Manual - Page 322

See the example below. When you end this high-speed driving, return to the cold inflation pressure shown on the Tire-Loading Information label. Example: You'll find maximum load and inflation pressure molded on the tire's sidewall, in small letters near the rim flange. It will read something like this: Maximum load 690 kg (1521 Ibs) @ 300 kPa (44 psi) Max. Press. For this example, you would set the inflation pressure for high-speed driving at 35 psi (244 kPa). If your tires have too much air (overinflation), you can get the following: Unusual wear Badhandling Roughride Needless damage from road hazards When to Check Check your tires once a month or more. Don't forget your compact spare tire. It should be at 60 psi (420 kPa). Notice: Don't let anyone tell you that underinflation or overinflation is all right. It's not. If your tires don't have enough air (underinflation), you can get the following: Too much flexing Too much heat Tireoverloading Bad wear Badhandling Bad fuel economy 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 by looking at them. Radial tires may look properly inflated even when they're underinflated. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keenin9 out dirt and moisture. 5-63