VW Golf manuals

Volkswagen Golf Service & Repair Manual: Run-flat tyres, seal inside technology

The vehicles are equipped with self-sealing tyres as an option.
This technology, referred to as seal inside technology, is a system that has been developed to allow the car to continue to be driven even if a nail or screw has penetrated the tyre: if screws or nails penetrate the tyre, a protective layer on the inside of the tyre tread immediately seals the resulting holes.
This means no air can escape. The sealing function is effective for almost all air leaks induced by objects up to 5 millimetres in diameter.
These may not be fitted in combination with other tyre types, e.g. run-flat tyres or “normal” tyres.
Explanation for mobility tyres
The seal inside technology comprises a sealing compound which is applied during production by the tyre manufacturer as a preventative measure.
The seal inside technology comprises a self-adhesive, viscous sealing compound that is applied in an even coat from shoulder to shoulder on the inside of the tread.
The sealing compound represents an integral component of the mobility tyre.
A mobility tyre can be identified by a special logo on the outside of the sidewall.
Example: sidewall of a Continental tyre
The sealing compound is not intended as a permanent tyre repair following a puncture.

Run-flat tyres, seal inside technology

If a foreign body with a diameter up to 5 mm punctures the running surface of a mobility tyre, the function of the sealing compound is to surround the object and to prevent any possible air loss by effecting an almost immediate seal.

Run-flat tyres, seal inside technology

The sealing compound is designed to seal the majority of puncture types caused by foreign bodies up to 5 mm in diameter.
The seal inside technology significantly reduces the frequency of flat tyres, but it is not intended to allow the tyre to be operated with reduced pressure or when flat (without air).
In all other respects, mobility tyres display the same properties as tyres without the seal inside technology.
Handling mobility tyres
When handling mobility tyres, take particular care to maintain cleanliness during work and also when storing tyres.
The sealing compound on the inside of the running surface of the tyre is not protected and is therefore very susceptible to any type of contamination.
We recommend storing each tyre individually in a sufficiently large plastic bag or similar.
As with any other tyre, mobility tyres should be regularly checked for signs of cuts, penetrations and loss of inflation pressure.
This inspection should be conducted at least once or twice a month, and always prior to each long trip.
Penetrations or damage that is not attended to in good time can lead to a loss of inflation pressure and/or failure of the tyre.
Mobility tyres with damage by cuts and/or penetrations must be inspected immediately.
It is necessary to decide whether the tyre must be taken out of use and scrapped.
Removing and installing the mobility tyre involves the same procedure as a normal tyre.

Run-flat tyres, seal inside technology

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