Volkswagen Golf Service & Repair Manual: Matching wheels and tyres
| 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 |
| – |
Press tyre beads off wheel rim flanges. |
| – |
Apply tyre assembly paste all round the tyre beads. |
| – |
Rotate tyre by 180° relative to wheel rim. |
| – |
Pump up tyre to approx. 4 bar. |
| – |
Attach the wheel (together with tyre) to the wheel balancing
machine. |
| – |
Check wheel for true running and for radial and lateral
runout . |
 Note
| If the specified values for radial and lateral run-out are
not exceeded, the wheel can be balanced to 0 gram. Specified
values appear on
→ Anchor. |
| If the radial and lateral run-out is not within the
specifications, the tyre must be rotated again. |
| – |
Let air out and press tyre beads off the wheel rim flanges. |
| – |
Rotate tyre by 90° relative to wheel (quarter of a turn). |
| – |
Pump up tyre again to 4 bar and check true running. |
Note
| If the specified values for radial and lateral run-out are
not exceeded, the wheel can be balanced to 0 gram. |
| If the radial and lateral run-out are not within the
specified values, the tyre must be rotated again. |
| – |
Press tyre off wheel rim flange again as described above. |
| – |
Rotate tyre by 180° relative to wheel rim (half a rotation). |
| If the radial and/or lateral runout are still not within the
specified values, check the wheel for radial and/or lateral
runout
→ Chapter. |
| If the measured values for radial and lateral runout of the
wheel are within the specified values, the tyre has
impermissibly high radial or lateral runout. In this case, the
tyre must be renewed. |
Note
| After fitting the tyres there will be fitting lubricant
between the tyres and the rim flanges. |
| You should therefore avoid severe braking and acceleration
manoeuvres for the first 100 or 200 km driven. Otherwise, the
tyres can turn on the wheel rim. In this case, your work will
have been in vain! |
|
|
|
–
Attach rim to wheel balancing machine.
–
Use the centring system for wheel balancing machines -VAS
5271-.
...
What is a flat spot?
The terms flat area and flats are also used for the term
flat spot.
Flat spots caused by storage or handl ...
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Checking radial and lateral run-out on wheel rim
Determining flat spots on tyres