Volkswagen Golf Service & Repair Manual: Swellings in the tyre sidewall
| A swelling in the sidewall of the tyre indicates that the
substructure of the carcass has been damaged. |
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| Typical causes for such damage include, for example, driving
over kerbs at a sharp angle. |
| Pinching the tyre in this way can damage the carcass. |
| The substructure of the tyre is stretched so far that
individual fibres in the carcass may be broken. |
| The extent of the damage depends on the speed of impact, the
angle of impact, the tyre pressure, the axle load and the type
of obstacle. |
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| Pinch marks on tyre sidewall -arrows- |
 Note
| Driving over kerbs should be avoided. |
| If you cannot avoid driving over a kerb, you should do so
very slowly and as square-on as possible. |
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| Interior view of a tyre with a punctured carcass |
| Due to a severe impact, the carcass was pinched on the wheel
rim flange and is ruptured in the contact area. |
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| Damage inside tyre due to impact injury (double rupture) |
| Double rupture -arrows- caused
by pinching when a kerb was driven over. Often not detectable
from outside. |
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| Cut caused by a sharp-edged obstacle
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This type of flat spots may be caused by hard braking on a
rough surface such as a tarmac road.
During this type of braking manoeuv ...
Driving over hard, pointed objects like nails, screws and
the like can pierce the tyre.
This always leads to tyre damage.
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Flat spots caused by hard braking
Damage caused by foreign bodies