2006 Pontiac GTO Owner's Manual - Page 249

How you load your vehicle affects vehicle handling and ride comfort. When driving with less than the maximum load capacity allowed for your vehicle, you can set tire inflation pressure to the recommended amounts shown in the following chart. Never load your vehicle with more weight than it was designed to carry. Recommended Cold Tire Inflation Occupant and Cargo Weight: Occupant and Cargo Weight: Up to 740 lbs (330 kg) 470 lbs (210 kg) or Less (Vehicle Capacity Weight) Front Tires Rear Tires Front Tires Rear Tires 30 psi (210 kPa) 30 psi (210 kPa) 35 psi (240 kPa) 35 psi (240 kPa) 33 psi (230 kPa) 33 psi (230 kPa) 33 psi (230 kPa) 39 psi (270 kPa) 60 psi (420 kPa) 60 psi (420 kPa) 60 psi (420 kPa) 60 psi (420 kPa) Tire Size 245/45ZR17 95W 235/40ZR18 91W T145/70R17 96M (Compact Spare) When to Check Check your tires once a month or more. Do not forget your compact spare tire. It should be at 60 psi (420 kPa). For more information about your vehicle's compact spare tire, see Compact Spare Tire on page 5-76. 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. Check the tire's inflation pressure when the tires are cold. Cold means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). Remove the valve cap from the tire valve stem. Press the tire gage firmly onto the valve to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until you reach the recommended amount. If you overfill the tire, release air by pushing on the metal stem in the center of the tire valve. Recheck the tire pressure with the tire gage. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture. 5-59