Checking disc wheels

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 tyres and wheels without tyres, use a tyre measuring gauge.  .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

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

Maximum permissible radial runout and lateral runout -a-  of alloy wheels = 0.7 mm.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

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

1. To measure wheels without tyres, remove the wheel from the vehicle. → 440519 REMOVING AND INSTALLING WHEEL 
2. Remove the tyre from the alloy wheel. → 444019 MOUNTING TYRES (REMOVING AND INSTALLING TYRES) 
3. Clamp the wheel on the balancing machine and take measurements at the points -a-  .