2009 Chevrolet Cobalt Owner's Manual - Page 328

Tire Inspection and Rotation We recommend that you regularly inspect the vehicle's tires, including the spare tire, if the vehicle has one, for signs of wear or damage. See When It Is Time for New Tires on page 5-71 for more information. Tires should be rotated every 5,000 to 8,000 miles (8 000 to 13 000 km). See Scheduled Maintenance on page 6-4. If this vehicle has P225/40R18 size tires, they should be rotated every 3,000 miles (5 000 km). The purpose of a regular tire rotation is to achieve a uniform wear for all tires on the vehicle. This will ensure that the vehicle continues to perform most like it did when the tires were new. Any time you notice unusual wear, rotate the tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See When It Is Time for New Tires on page 5-71 and Wheel Replacement on page 5-76. When rotating the vehicle's tires, always use the correct rotation pattern shown here. Do not include the compact spare tire, if the vehicle has one, in the tire rotation. After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Tire and Loading Information label. See Inflation - Tire Pressure on page 5-62 and Loading the Vehicle on page 4-26. 5-70