Pontiac G8 Tire Sizes and Rim Specifications by Year & Trim

The Pontiac G8 offers a range of tire sizes and rim specifications depending on the model year and trim level. Early years generally feature standard tire sizes like 235/55R17 on base trims, while sportier trims often come with wider rims and lower profile tires.\n\nFor example, the Pontiac G8 GT trim typically rides on 18×8-inch rims with 235/50R18 tires, offering improved handling and a sportier stance. The GXP trim pushes this further with 19×8.5-inch wheels paired with 245/45R19 tires, enhancing both performance and aesthetics.\n\nWhen comparing trims, note that rim width and diameter directly influence tire options, ride comfort, and driving dynamics. Always verify tire markings to ensure compatibility and safety when considering aftermarket replacements or interchanging wheels between trims.\n\nKeeping track of tire size markings by model year and trim is crucial for maintenance and upgrades. Consult your vehicle’s specifications to match the recommended sizes, ensuring optimal performance and avoiding fitment issues.

For bolt pattern (PCD), offset ET, center bore, and mounting details, open the bolt pattern page for Pontiac G8.