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The 2008 GMC Sierra is equipped with a bolt pattern of A6 X5.5 inches or 139.7mm from the manufacturer. This indicates that the SRX lug nuts on your wheels are spaced 5.5 inches apart. When looking for new wheels, ensure they have this precise bolt pattern. While adapter plates are available, they may lead to significant damage to your vehicle's wheel hub. It is advisable to visit a reputable tire and wheel store to verify that the tires and wheels will properly fit your car. Additionally, when upgrading wheels, be cautious not to go too wide as this can result in rubbing when turning.
The standard bolt pattern for a 2008 GMC Sierra is 6 lugs with a spacing of 5.5 inches or 139.7 millimeters, along with a standard offset.