2005 Lexus SC 430 Owners Manual - Page 344

CHASSIS You should check the tire inflation pressure every two weeks, or at least once a month. And don't forget the spare, if so equipped. The inflation pressure for the spare tire should be 420 kPa (4.3 kgf/cm2, 4.2 bar, 60 psi). The following instructions for checking tire inflation pressure should be observed: D The inflation pressure should be checked only when the tires are cold. If your vehicle has been parked for at least 3 hours and has not been driven for more than 1.5 km or 1 mile since, you will get an accurate cold tire inflation pressure reading. D If you cannot adjust the tire inflation pressure when the tires are cold, add 10 to 20 kPa more to the front tires and rear tires than the cold tire inflation pressure, but never exceed the maximum cold tire inflation pressure molded on the tire sidewall. D Always use a tire pressure gauge. The appearance of the tire can be misleading. Besides, tire inflation pressures that are even just a few pounds off can degrade handling and ride. D Do not bleed or reduce tire inflation pressure after driving. It is normal for the tire inflation pressure to be higher after driving. 63ca03 "Type B The recommended cold tire inflation pressure, tire size and the combined weight of occupants and cargo (vehicle capacity weight) are described on the tire and loading information label. 318