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. |
 Note
| 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. |
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| Example: sidewall of a Continental tyre |
Caution
| The sealing compound is not intended as a permanent
tyre repair following a puncture. |
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| 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. |
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| 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. |
| 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. |
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Removing and fitting run-flat tyres
→ Chapter.
If run-flat tyres are used, a Tyre Pressure Monitor display
must be fitted.
...
Run-flat tyres (PAX) are specially developed tyres that
differ from conventional tyres as follows:
PAX tyre with support ring
...
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Run-flat tyres, structure of a PAX tyre