Wheels and Tires, Matching

Wheels and Tires, Matching

General Information

If radial or lateral run-out from wheel or tire meet each other, the untrue running of the wheel and tire is increased.

For technical reasons, 100% true running is not possible => [ Tire and Wheel Radial and Lateral Run-Out, Checking ] Tire and Wheel Radial and Lateral Run-Out, Checking.

Drive the tires until they are warm before matching them to the tires already on the vehicle. This eliminates flat spots from standing which may exist => [ Flat Spots in Tires From Standing ] Flat Spots in Tires From Standing.

Work Procedure For Match-Mounting

- Let the air out of the tire.

- Remove the tire bead from the wheel rim flange.

- Coast the tire bead all the way around with tire mounting paste.

- Rotate the tire 180° relative to the disc wheel.

- Inflate the tire to approximately 4 bar.

- Tension the wheel with the tire on the balancing machine.

- Check the run-out or the radial and lateral run-out, as necessary.

• If the radial and lateral run-out value is not exceeded, the wheel can be balanced to 0 grams. Specifications are found on => [ Tolerances For Radial And Lateral Run-Out Of Disc Wheel With Tire ] Tire and Wheel Radial and Lateral Run-Out, Checking.

• If the radial and lateral run-out lies outside the specified values, the tire must be turned again.

- Let the air out and remove the tire beads from the wheel rim flanges.

- Rotate the tire 90° (one quarter of a turn) relative to the disc wheel

- Inflate the tire to 4 bar again and check the run-out.

• If the radial and lateral run-out value is not exceeded, the wheel can be balanced to 0 grams.

• If the radial and lateral run-out is still outside the specified values, the wheel must be turned again.

- Remove the tire from the wheel rim flanges again.

- Rotate the tire 180° (half of a turn) relative to the disc wheel

If the values for radial or lateral run-out are still outside the specified values, check the wheel for radial and lateral run-out => [ Rim Radial and Lateral Run-Out, Checking ] Rim Radial and Lateral Run-Out, Checking.

If the measured values for radial and lateral run-out of the wheel disc are within the specified values, then the tire has excessive radial or lateral run-out. In this case, the tire must be replaced.

• Assembly paste from mounting tires is located between tires and rim flanges.

• Avoid strong braking or acceleration maneuvers during the first 100 to 200 km. Otherwise, the tires can rotate on the rims and the work done would then be undone!