| When radial or lateral runout of the wheel and tyre coincide, the imbalance of the wheel is amplified by the tyre. |
| For technical reasons, 100% true running is not possible → Chapter. |
| Before match mounting the used wheels which are fitted on the vehicle, run the tyres warm. This will eliminate any flat spots caused by storage or handling, → Chapter. |
| Procedure for match mounting |
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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 paste. |
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| Rotate the tyre 180° relative to the wheel. |
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| Inflate the tyre to approx. 4 bar. |
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| Mount the wheel with tyre on the wheel balancer. |
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| Check true running, that is, radial and lateral runout. |
Note | t
| If the specified values for radial and lateral runout are not exceeded, the wheel can be balanced to 0 gram. Specified values appear on → Anchor. |
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| If the radial and lateral runout is not within the specifications, 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. |
Note | t
| If the specified values for radial and lateral runout are not exceeded, the wheel can be balanced to 0 gram. |
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| If the radial and lateral runout 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 runouts are still not within the specifications, check the radial and/or lateral runouts of the wheel: → Chapter. |
| If the measured values for radial and lateral runout of the wheel are within the specified values, the tyre has an impermissibly high radial or lateral runout. In this case, the tyre must be renewed. |
Note | t
| After fitting the tyres there will be fitting lubricant between the tyres and the rim flanges. |
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| Therefore, severe braking and acceleration manoeuvres must be avoided for the first 100 or 200 km driven. The tyres may otherwise rotate on the rims and your work will have been in vain. |
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