2008 Cadillac STS Owner's Manual - Page 396

Your vehicle's original equipment tires are listed on the Tire and Loading Information label. See Loading Your Vehicle on page 4-26, for more information about the Tire and Loading Information label and its location on your vehicle. Vehicles that have 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 on page 5-80. {CAUTION: If you add different sized wheels, your vehicle may not provide an acceptable level of performance and safety if tires not recommended for those wheels are selected. You may increase the chance that you will crash and suffer serious injury. Only use GM specific wheel and tire systems developed for your vehicle, and have them properly installed by a GM certified technician. See Buying New Tires on page 5-76 and Accessories and Modifications on page 5-3 for additional information. Different Size Tires and Wheels If you add wheels or tires that are a different size than your original equipment wheels and tires, this may affect the way your vehicle performs, including its braking, ride and handling characteristics, stability, and resistance to rollover. Additionally, if your vehicle has electronic systems such as, anti-lock brakes, traction control, and electronic stability control, the performance of these systems can be affected. 5-78