When radial or lateral run-out of the wheel and tyre coincide, the out-of-true running of the wheel is amplified by the tyre. |
For technical reasons, 100% true running is not possible when there is radial and lateral run-out on the wheel and tyre. |
Under unfavourable circumstances, the radial or lateral run-out of the entire wheel with tyre may be greater than permitted. |
The individual values of the wheel and the tyre may nevertheless each be within the permitted tolerances. |
Turning the tyre strategically with respect to the wheel can partially compensate for radial or lateral run-out. |
This procedure, known as "match mounting", can be used to optimise the true-running properties of the wheel and tyre assembly. |
Before match mounting the used wheels which are fitted on the vehicle, the tyres must be run warm. This will eliminate any flat spots caused by storage or handling. |
Procedure for match mounting: |
Note t
| On rims with bonded wheel trims, take care not to scratch the wheel trims. |
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| Wheel trims have a very sensitive surface. |
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| If a wheel trim is damaged, the rim must be renewed. |
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