Replace any wheels that are bent or dented, or have excessive lateral or radial runout. Wheels with runout greater than specified may cause objectionable vibrations.

1. Use a straight edge 203-229 mm (8-9 in) long. Place the straight edge on the wheel inboard mounting surface. Try to rock the straightedge up and down within the mounting surface.



2. Repeat this procedure on at least 3-4 different positions on the inboard mounting surface.

•	The outer ring of the mounting surface normally is raised above everything inside the mounting surface.

•	The mounting surface will be raised above the outer ring if the wheel mounting surface has been bent on a tire changer.

•	If you can rock the straight edge, the mounting surface is bent and you must replace the wheel.




3. Inspect the mounting wheel/nut holes for damage caused from over-torquing the wheel/nuts. Inspect for collapsed wheel/nut bosses. Inspect for cracked wheel bosses.

Caution: The use of non-GM original equipment wheels may cause:

•	Damage to the wheel bearing, the wheel fasteners and the wheel

•	Tire damage caused by the modified clearance to the adjacent vehicle components

•	Adverse vehicle steering stability caused by the modified scrub radius

•	Damage to the vehicle caused by the modified ground clearance

•	Speedometer and odometer inaccuracy

Note: 

•	Replacement wheels must be equivalent to the original equipment wheels in the following ways:

-	The load capacity

-	The wheel diameter

-	The rim width

-	The wheel offset

-	The mounting configuration

•	A wheel of the incorrect size or type may affect the following conditions:

-	Wheel and hub-bearing life

-	Brake cooling

-	Speedometer/odometer calibration

-	Vehicle ground clearance

-	Tire clearance to the body and the chassis

4. Replace the wheel if the wheel is bent.
5. Replace the wheel if the wheel/nut boss area is cracked.

Identify steel wheels with a 2 or 3 letter code stamped into the rim near the valve stem. Aluminum wheels have the code, the part number, and the manufacturer identification cast into the back side of the wheel.