Checking Disc Wheel (Radial And Lateral Runout)

Information 

• Straightening and welding work cannot be performed on light alloy wheels. 
• The work is carried out initially with the wheel mounted on the vehicle. 
• To measure wheels with tires and wheels without tires, use a tire measuring gauge, e.g. VAG. 1435  .
  Fig 1: Identifying Tyre Gauge

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Maximum permissible radial runout and lateral runout of the wheel with tire = 1.25 mm. Values less than 1.0 mm - around 0.5 mm would be better - are desirable. For this purpose, match the tire (turn the tire on the rim if necessary).

Maximum permissible radial runout and lateral runout (axial and radial runout deviations) -a-  of alloy wheels = 0.7 mm.

Fig 2: Identifying Axial And Radial Runout Deviations Measurement Points

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

If further measurements are necessary in isolated cases, carry out the following procedure:

1. To measure wheels without tires, remove the wheel from the vehicle. → 440519 REMOVING AND INSTALLING WHEEL .
2. Remove the tire from the alloy wheel. → 444019 REMOVING AND INSTALLING TYRE .
3. Clamp the wheel on the balancing machine and take measurements at the points -a-  .