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Volkswagen Golf Mk7 Service & Repair Manual: Damage caused by foreign bodies

Driving over hard, pointed objects like nails or screws always damages a Volkswagen Golf Mk7 tyre — this page explains how an embedded foreign body is often securely lodged and easy to miss.

Driving over hard, pointed objects like nails, screws and the like can pierce the tyre.
This always leads to tyre damage.
   
Damage due to embedded foreign body
Often, the object -marking- is so securely embedded in the tyre that it will not free itself even at higher speeds. Consequently, it can act as a plug and seal the tyre relatively well. This results in a gradual loss of pressure, which the driver will not notice immediately, but which can lead to sudden and complete tyre failure.
  Note
No repair should be attempted on a steel-belted tyre of which the structure has been punctured by a foreign body.
 

Damage caused by foreign bodies

    Questions & answers

    Damage caused by foreign bodies — Volkswagen Golf Mk7

    What foreign body damage can Golf Mk7 tyres suffer?
    Nails, screws, glass or stones can penetrate the tread. Small tread-area punctures may be repairable; sidewall penetration requires replacement.
    Swellings in the tyre sidewall
    A swelling in the sidewall of the tyre indicates that the substructure of the carcass has been damaged.     Typic ...

    Stripped profile
    Tyres with stripped profile Such damage usually develops over a longer period of time. If an already damaged tyre is exposed to high stress, the ...