Running gearMatch mounting
| 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: |
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| 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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| The wheel trim cannot be renewed. |
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| Press the tyre beads off the rim flanges. |
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| Coat the tyre bead all round with tyre fitting lubricant. |
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| Rotate the tyre 180° with respect to the wheel. |
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| Inflate the tyre to approx. 4 bar. |
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| Clamp wheel with tyre on balancer. |
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| Check true running/radial and lateral run-out. |
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| If the specified value for radial and lateral run-out is not exceeded, the wheel can be balanced to 0 grams. For specified values, refer to page → Anchor. |
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| If the radial and lateral run-out are not within the specified values, the tyre must be rotated again. |
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| Deflate the tyre and press off the tyre beads from the rim flanges. |
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| Rotate the tyre 90° with respect to the wheel (1/4 of a turn). |
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| Inflate the tyre to 4 bar again and check true running. |
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| If the specified value for radial and lateral run-out is not exceeded, the wheel can be balanced to 0 grams. |
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| If the radial and lateral run-out are not within the specified values, the tyre must be rotated again. |
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| Press the tyre off the rim flanges again as described above. |
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| Rotate the tyre 180° with respect to the wheel (1/2 a turn). |
| If the radial and/or lateral run-out are still not within the specified values, check the rim for radial and/or lateral run-out. |
| If the measured values for radial and lateral run-out of the wheel are within the specified values, the tyre has an impermissibly high radial or lateral run-out. In this case, the tyre must be renewed. |
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01 Steering & suspension
