GM Service Manual Online
For 1990-2009 cars only

Abnormal or Excessive Tire Wear Wear

If abnormal or excessive tire wear exists, inspect the vehicle for the following conditions:

    â€¢ Hard driving
    â€¢ Incorrect tire inflation pressure
    â€¢ Tires not rotated at recommended intervals
    â€¢ Tire and wheel out of balance
    â€¢ Incorrect front or rear wheel alignment
    â€¢ Sagging or broken springs
    â€¢ Worn strut dampers
    â€¢ Overloaded vehicle
    â€¢ Excessive wheel runout