Wheel Mounting Surface Check

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





2. Repeat this procedure on at least 3 or 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 is raised above the outer ring if the wheel mounting surface is bent on a tire changer.





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.

Notice: 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

Important:
^ Replacement wheels must be equivalent to the original equipment wheels in the following ways:
- Load capacity
- Wheel diameter
- Rim width
- Wheel offset
- Mounting configuration
^ A wheel of 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. 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.