To find out what kind and size of tires you need, look at the Tire and Loading Information label. See Loading the Vehicle , for an example of the label and where it can be found on your vehicle.

The tires installed on your vehicle when it was new had a Tire Performance Criteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, GM recommends that you get tires with that same TPC Spec number. That way your vehicle will continue to have tires that are designed to give proper endurance, handling, speed rating, load range, traction, ride, tire pressure monitoring system performance and other things during normal service on your vehicle. If your tires have an all-season tread design, the TPC number will be followed by an "MS" (for mud and snow).

The optional 18-inch performance tires, size 255/45ZR18 99Y, used on some vehicles, meet the General Motors Tire Performance Criteria Specification (TPC Spec) rating but the TPC Spec code has not been molded onto the tire's sidewall. If your vehicle has these tires, and you need to replace them, you can still get these TPC spec rated tires by asking your GM dealer. Your GM dealer can order these tires by part number. This way, your vehicle will continue to give the proper endurance, handling, traction, and ride as the original tires.

If you replace your tires with those not having a TPC Spec number, make sure they are the same size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires.

Winter tires with the same speed rating as your original equipment tires may not be available for H, V, W and ZR speed rated tires. If you choose snow tires with a lower speed rating, never exceed the tire's maximum speed capability.

If you replace your vehicle's tires with those not having a TPC Spec number, the tire pressure monitoring system may give an inaccurate low-pressure warning. Non-TPC Spec tires may give a low-pressure warning that is higher or lower than the proper warning level you would get with TPC Spec numbered tires.

Caution: Mixing tires could cause you to lose control while driving. If you mix tires of different sizes (other than those originally installed on your vehicle), brands, or types (radial and bias-belted tires), the vehicle may not handle properly, and you could have a crash. Using tires of different sizes (other than those originally installed on your vehicle), brands, or types may also cause damage to your vehicle. Be sure to use the correct size, brand, and type of tires on all wheels. It is all right to drive with your vehicle's compact spare temporarily, it was developed for use on your vehicle. See Compact Spare Tire .

Caution: If you use bias-ply tires on the vehicle, the wheel rim flanges could develop cracks after many miles of driving. A tire and/or wheel could fail suddenly, causing a crash. Use only radial-ply tires with the wheels on the vehicle.

Vehicles equipped with performance tires P235/50R17 95V (front axle) and P255/45R17 98V (rear axle) are mounted on wheels with different rim widths. The front axle tires are mounted on rims 7.5 inches (19.05 cm) wide and the rear axle tires require wheels with a minimum rim width of 8 inches (20.32 cm). The original equipment wheels designed for P255/45R17 98V size tires are etched with the words REAR ONLY. When replacing P255/45R17 98V size tires have them mounted on wheels with a minimum width of 8 inches (20.32 cm) and marked REAR ONLY. See Wheel Replacement .