2000 Saab 9-5 Owner's Manual - Page 198

198 Car care and technical information The wheels and tires have been carefully matched to the characteristics of the car and play a key role in its outstanding roadholding and handling. Never reduce the pressure of a hot tire. If the tires are hot when you check them, only increase the pressure, if necessary. Soft tires will cause faster wear than over-pressurized tires. They also increase fuel consumption. If a valve is leaking, simply unscrew it and fit a new one. Important! Remember to adjust the tire pressures if you change the load in the car or intend to cruise at a substantially higher or lower speed than normal. Wheels Alternative wheels and tires If you wish to fit other tires or wheels than those supplied with the car, consult your Saab dealer first as to the possibilities available. Wheels/tires combinations that are not approved by Saab can negatively affect the car´s directional stability, steering and braking in both wet and dry conditions. Do not assume that a wheel/tire combination will function properly just because it will bolt on. Tire pressure NOTE Check the tire pressures at least once per month. Underinflation is the main cause of: • Tires wearing out prematurely. • Damage to the sidewalls. • Damage to the wheels. Tires need to be inflated to suit the load carried and the maximum speed the car will be driven (see the recommended tire pressures on the back cover). Note that all values apply to cold tires. For tires with an aspect ratio less than /60, increase the tire pressure by 3 psi (20 kPa) for rough roads with potholes to minimize the risk of rim damage. NOTE For wide wheels and/or low-profile tires, bear in mind the following: • Tires and wheels can be damaged in potholes etc. • Springs and dampers can be overloaded. • The wheels can come into contact with chassis and body components. • The speed and load limits for the tires must not be exceeded; see page 199. • Wheels larger than 17" must not be fitted. The maximum permissible offset is 49 mm.