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Could you please provide the tire dimensions and recommended air pressure for the 2008 GMC Sierra 1500, as well as the size of the wheels it comes with?
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Depending on how your 2008 GMC Sierra is set up, it could come with various tire options. There are different factory tires used on three different factory rims. If you have 17-inch rims, you might have LT245/70R17 tires, P245/70R17, or P265/70R17. The recommended tire pressure is 50 PSI for the LT tires and 35 PSI for the P tires. For 18-inch rims, you'll have either P265/65R18 112H tires or P265/65R18 112S tires with a recommended inflation of 35 PSI. If you have the largest 20-inch rims, typically with the max trailer package or 20-inch wheel option, you'll have P275/55R20 111S tires with a recommended inflation of 35 PSI. The width of the wheel varies from 7.5 to 8.5 inches, and the bolt pattern is a consistent 6x139.7 with a 78.1mm center bore.
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The 2008 GMC Sierra 1500 comes with 17-inch silver aluminum wheels and has front tires sized at P265/70R17 and rear tires also at P265/70R17. Both the front and rear tires should be at a tire pressure of 35 pounds per square inch (psi).
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