A properly repaired tyre is not a downgraded tyre. It keeps the speed symbol and the load index it was built with, and there is no requirement to drive it more gently afterwards. People are often surprised, because the word repair suggests a compromise.
What makes it true is what the repair consists of. The wheel comes off the car, the tyre comes off the rim, and the inside of the casing is examined under a light, which is the only place the real evidence lives. The injury is reamed out to clean rubber so the plug has something to bond to. A stem fills the channel through the casing and a patch bonds across the inner liner, and the two are cured into one piece with the tyre rather than stuck to its surface. The liner holds the air. The casing holds the load. Restore both and nothing about the rating has changed.
An external plug does neither. It seals from the outside, leaves the liner open, and means nobody has looked inside a casing that has just been punctured.
A repair costs a fraction of a new tyre, which is exactly why it is worth having someone look properly instead of guessing. Either way the car has not moved from Shepherd's Bush or wherever you left it. The Ravenscourt Park phone and the Shepherd's Bush phone ring the same fitter, any hour. Midnight in Barons Court, midday in King Street, the same call either way. A W6 address in King Street and one in Brook Green are the same round.

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Saving a tyre is worth more around here than the tyre itself, because the alternative costs you a parking space and half a day as well. We repair at the kerb, on permit bays and in the office car parks off the Great West Road, and the wheel goes back balanced. Where the damage sits outside the repairable band you hear that first.
The tyre had held air for a year, so on the face of it the plug had worked. Inside, the liner was torn around the entry point and the rubber near the belts had begun breaking down. Holding air is not the same as being sound.
The owner assumed a repair would cost them the rating they paid for when the tyre was new. It does not work that way. The repair went in to BS AU 159 and the tyre kept the speed symbol moulded into its sidewall.
Every repair we finish is marked on the sidewall beside where it sits. It means whoever takes that tyre off in three years can see what was done, where, and whether a second repair would land too close to the first.
No. That belief comes from temporary repairs and from the emergency canisters supplied with cars, which do carry restrictions. A repair carried out to the British Standard, inside the permitted area of the tread, hands the tyre back at its original ratings.
More than once is possible, but there are limits and they are not ours to bend. Repairs must not overlap, each must sit within the repairable band, and there is a point at which a casing has had enough.
A repair done to the standard and sitting within the tread area is entirely acceptable at a test. What fails is a repair in the shoulder or the sidewall, a visible external plug, or damage that was never repairable and should have been a replacement.
Because you cannot vouch for what you have not seen. The evidence of whether a casing has been hurt is on the inner liner, and bonding a patch to it means being inside the tyre anyway. Anything done from the outside is a guess.
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