Wheel Mounting Surface Check
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Wheel Mounting Surface Check
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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.
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1.
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Thoroughly clean the wheel mounting surface with a clean shop towel and denatured alcohol, or equivalent.
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2.
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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 straight edge up and down within the mounting surface.
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3.
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For aluminum flat-mount wheels, repeat the procedure in step 2 on at least 3-4 different positions on the inboard mounting surface.
If you can rock the straight edge, the mounting surface is bent and you must replace the wheel.
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4.
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Check the wheel nuts/mounting holes for damage from excessively hard tightening. Check for sheared wheel rims/nut lugs. Inspect for cracked wheel bosses.
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5.
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For steel wheels, repeat the procedure in step 2 on at least 3-4 different positions on the inboard mounting surface.
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The outer mounting ring is designed to be raised slightly above the inner mounting ring.
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If you can rock the straight edge, the mounting surface is bent and you must replace the wheel.
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6.
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Check the wheel nuts/mounting holes for damage from excessively hard tightening. Check for sheared wheel rims/nut lugs. Inspect for cracked wheel bosses.
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7.
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Warning
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The use of non-GM original equipment wheels may cause:
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Damage to the wheel bearing, the wheel fasteners and the wheel
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Tire damage caused by the modified clearance to the adjacent vehicle components
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Adverse vehicle steering stability caused by the modified scrub radius
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Damage to the vehicle caused by the modified ground clearance
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Speedometer and odometer inaccuracy
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Note
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Replacement wheels must be equivalent to the original equipment wheels in the following ways:
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The mounting configuration
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A wheel of the incorrect size or type may affect the following conditions:
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Wheel and hub-bearing life
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Speedometer/odometer calibration
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Vehicle ground clearance
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Tire clearance to the body and the chassis
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Replace the wheel if the wheel is bent.
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8.
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Replace the wheel if the wheel/nut boss area is cracked.
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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.
