When a tyre is damaged, the question is always the same: fix it or bin it? The answer is not a judgment call so much as a checklist. A few clear factors decide it, and most come down to where the damage is and how much tyre is left.
Where the damage is
This is the first and biggest factor:
- Central tread (the middle three-quarters), repairable, within the repairable area of a tyre
- Outer shoulder or sidewall: not repairable; the tyre is replaced
- A bulge anywhere means the casing has failed inside and the tyre is scrap, as covered under a sidewall bulge
How bad the damage is
Within the repairable zone, size and history still matter:
- Punctures up to around 6 mm in a car tyre can usually be repaired; larger holes cannot
- A tyre driven on while flat is often wrecked internally even if the outside looks fine
- A tyre with an existing repair too close to the new damage cannot be repaired again there
A proper repair is done from the inside as a combined plug and patch to the British Standard, not an external plug pushed in at the roadside.
What else pushes it toward replacement
Even repairable damage can tip into replacement once the rest of the tyre is weighed up:
- Low tread: if the tyre is near the legal tread limit, paying to repair it makes little sense
- Age: a tyre showing cracking or dry rot is near the end regardless
- A pattern of punctures on the same tyre
If it is replacement
A like-for-like tyre goes back on, the same size, load index and speed rating the car calls for. Ordering the right size from an online tyre shop such as Tyres.co.uk and booking it in at a local fitter keeps a replacement simple, and if the others are worn it is the moment to think about doing them in pairs so grip stays even.
From the workshop: the customer wants the cheap repair, I get it. But if it's in the shoulder, or it's been driven flat, or there's two mil of tread left, repairing it is throwing good money after bad. I'd rather tell someone straight it needs a tyre than patch something I don't trust.
Sources and accuracy. This reflects BS AU 159 repair criteria and standard practice at the time of writing. A tyre professional makes the final call on a specific tyre. If anything here looks wrong, get in touch and we will check it and put it right.
Common questions
When can a tyre be repaired?+
When the damage is a small puncture in the central tread, the tyre has not been driven on flat, it has enough tread left, and it is not perished or already repaired nearby. Damage in the sidewall or outer shoulder, large holes, and run-flats that have lost pressure generally cannot be repaired.
Is a repaired tyre as safe as a new one?+
A repair carried out to the British Standard, from the inside with a combined plug and patch, restores the tyre to full use and is considered permanent. A simple external plug pushed in without removing the tyre is a temporary get-you-home measure, not a proper repair.
Can a sidewall puncture be repaired?+
No. The sidewall flexes constantly and is not permitted to be repaired, so a sidewall puncture, cut or bulge means the tyre is replaced. The same applies to the outer shoulder, just inside the sidewall.
Should I replace one tyre or two?+
One is fine if the others have similar tread and condition. On a car where grip needs to stay even, replacing in pairs across an axle is worth considering, and the newer tyres are usually fitted to the rear.