2006 Saab 9-3 Owner's Manual - Page 257

Car care Inflation - Tire Pressure The Tire-Loading Information label 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). 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 • Tire overloading • Bad wear • Bad handling • Bad fuel economy If your tires have too much air (overinflation), you can get the following Unusual wear Bad handling Rough ride Needless damage from road hazards Adjust the tire pressure to match the current load and speed of the car (see page 306). The stated tire pressures apply to cold tires, i.e. tires that are the same temperature as the outside air temperature. Tire pressure increases as the tires become warm (e.g. during highway driving) by approximately 4 psi (28 kPa). When the temperature of the tires changes by 50°F (10°C), the tire pressure will change 2 psi (14 kPa). Never reduce the pressure of a hot tire. If the tires are hot when you check them, only increase the pressure, if necessary. 257 High speed operation WARNING Driving at high speeds, 100 mph (160 km/h) or higher, puts an additional strain on tires. Sustained high-speed driving causes excessive heat build up and can cause sudden tire failure. You could have a crash and you or others could be killed. Some high-speed rated tires require inflation pressure adjustment for high speed operation. When speed limits and road conditions are such that a vehicle can be driven at high speeds, make sure the tires are rated for high speed operation, in excellent condition, and set to the correct cold tire inflation pressure for the vehicle load.