Wheels & Tires: Balancing: Matching

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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,, 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.

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.

Matching procedure:

NOTE:

Be careful not to scratch off the glued- on wheel trim on these rims.

The surface of the wheel trim is very sensitive.

The rim will have be replaced if the wheel trim is damaged.

The wheel trim cannot be replaced.

Courtesy of AUDI OF AMERICA, LLC

-- Let the air out of the tire.

-- Press the tire beads off the rim flanges.

-- Coat the tire beads all around with tire mounting paste.

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

-- Inflate the tire to approximately 4 bar (58 psi).

-- Tension wheel with tire on balancing machine.

-- Check the run-out or the 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. Refer to RIM 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 of the tire and press the tire beads off the rim flanges.

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

-- Inflate the tire to 4 bar (58 psi) 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.

-- Press the tire beads off the rim flanges.

-- Rotate the tire 180° (one half 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.

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.