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Matched Mounting Audi A4 B7

Wheel and Tire Guide ~455 words

Matched Mounting

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

100% true running is not possible for technical reasons, --> Wheel and Tire Radial and Lateral Run-Out , radial and lateral run-out on wheel/tire.

Under unfavorable circumstances, the lateral or radial run-out of the combined wheel and tire can exceed the permitted tolerance.

The individual values of the disc wheel and tire may nevertheless be below the specified value.

Targeted rotating of the tire relative to the wheel can partially balance out the radial and lateral run-out.

Tire specialists call this procedure match-mounting, whereby the true running of the wheel and tire can be optimized.

Before matching wheels which have been mounted and driven on a vehicle, they must be driven until warm. This eliminates flat spots from standing which may exist --> Tire Flat Spots from Standing .

Matching procedure

  1. Let air out of the tire.
  1. Press tire beads off rim flanges.
  1. Coat tire beads all around with tire mounting paste.
  1. Rotate tire 180 relative to disc wheel.
  1. Inflate tire to approx. 4 bar.
  1. Tension wheel with tire on balancing machine.
  1. Check run-out or radial and lateral run-out, as necessary.

Note. If the radial and lateral run-out value is not exceeded, the wheel can be balanced to 0 grams. Specifications are found on --> Specifications for radial and lateral run-out on wheel . If the radial and lateral run-out lies outside the specified values, the tire must be turned again.

  1. Let the air out of the tire and press the tire beads off the rim flanges.
  1. Rotate the tire 90 (one quarter turn) relative to the disc wheel.
  1. Inflate the tire to 4 bar and check for true running.

Note. 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.

  1. Press tire beads off rim flanges.
  1. Rotate tire 180 (one half turn) relative to disc wheel.

If values for radial or lateral run-out are still outside specified values, check wheel for radial and lateral run-out --> Wheel and Tire Radial and Lateral Run-Out, Checking with VAG 1435 .

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

Note. 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!