GM Service Manual Online
For 1990-2009 cars only

A replacement tire should have the same load range and ply rating. This information is molded on the side wall of the tire.

Tire Wear


Object Number: 386773  Size: SF
(1)Hard Cornering/Underinflation
(2)Incorrect Alignment/Lack of Rotation
(3)Incorrect Alignment/Non-uniform Tire
(4)Heavy Acceleration/Over inflation
(5)Wear Indicator

Inspect the tire and wheel assemblies for the following conditions:

    • Unusual wear such as cupping, flat spots, and heel-and-toe wear
        (These conditions can cause tire growl, howl, slapping noises, and vibrations throughout the vehicle.)
    • Proper inflation
    • Bulges in the sidewalls
        (Do not confuse bulges with normal ply splices, commonly seen as indentations in the sidewall.)
    • Bent rim flanges

By inspecting these characteristics of the tire and wheel assemblies, you may discover the cause of the vibration. The inspection will also provide assurance that the vehicle is safe for road testing.