2007 Pontiac Grand Prix Owner's Manual - Page 414

Tire Inspection and Rotation Tire rotation is not recommended if your vehicle is a GXP model equipped with P255/45R18 size tires on the front wheels and P225/50R18 size tires on the rear wheels. Different tire sizes front to rear should not be rotated. Tire rotation is recommended if the original equipment tires installed on your vehicle are of the same size and type on all four tire/wheel positions. Original equipment tires of the same size and type should be rotated every 5,000 to 8,000 miles (8 000 to 13 000 km). Any time you notice unusual wear, rotate your vehicle's tires as soon as possible and check the wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 415 and Wheel Replacement on page 419 for more information. The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. See Scheduled Maintenance on page 473 for scheduled rotation intervals. Rotation Pattern for Non-GXP Tires Only The correct rotation pattern shown here is only for non-GXP tires. Do not include the compact spare tire, if equipped, in your vehicle's tire rotation. After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Tire and Loading Information label, and reset the Tire Pressure Monitor System. See Tire Pressure Monitor System on page 409 for additional information. 414