2001 Cadillac Catera Owner's Manual - Page 290

Inflation -- Tire Pressure The Tire-Loading Information label, which is located on the rear edge of the driver's door, shows the correct inflation pressures for your tires when they're cold. "Cold" means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). If you'll be driving at speeds higher than 100 mph (160 km/h) where it is legal, raise the cold inflation pressure of each tire to 38 psi (260 kPa) for tire size P225/55R16 and to 39 psi (270 kPa) for tire size 235/45R17. When you end this very high-speed driving, reduce the cold inflation pressures to those listed on the Tire-Loading Information label. 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: D Too much flexing D Too much heat D Tire overloading D Bad wear D Bad handling D Bad fuel economy. If your tires have too much air (overinflation), you can get the following: D Unusual wear D Bad handling D Rough ride D Needless damage from road hazards. When to Check Check your tires once a month or more. Also, check the tire pressure of the spare tire. 6-39