Wheels - Measuring Wheel Runout
Subject: MEASURING WHEEL RUNOUT ALL VEHICLESNumber: 83-T-75
Section: X
Date: September, 1983
MEASURING WHEEL RUNOUT:
TO: ALL CHEVROLET DEALERS
Wheel runout should be measured with an accurate dial indicator graduated in thousandths of an inch. Measurements may be taken with the wheel installed on the car, or off the car using an accurate mounting surface such as on a wheel balancer. Measurements may also be taken with or without the tire mounted on the wheel.
Radial runout and lateral runout should be measured on both the inboard and outboard rim flanges. Maximum runouts and recommended measurement locations are shown in chart. With the dial indicator firmly in position, slowly rotate the wheel one revolution and record the TIR (Total Indicator Reading). If any measurement exceeds these amounts, and if the vehicle should experience a vibration condition that wheel balancing will not correct, the wheel should be replaced. Disregard any indicator jumps due to welds, paint runs, scratches, etc.
Wheel Runout Specifications
Steel Wheels Aluminum Wheels
Radial Runout .040" .030"
Lateral Runout .045" .030"