Yes, many punctures can be safely repaired, but not all of them. Under the UK standard (BS AU 159), a puncture is repairable only if it's within the central three-quarters of the tread, the hole is no more than 6mm in diameter, and the tyre has no other damage. Anything in the sidewall or shoulder, or a tyre that's been driven on while flat, generally means a replacement.
When a puncture can be repaired
A repair is on the table when all of these conditions are met, which is why a fitter checks each one:
- The damage is in the central tread area (the minor repair zone).
- The hole is 6mm or smaller.
- There's no sidewall damage, perishing or previous bad repair.
- The tyre wasn't driven flat, which overheats and weakens the structure.
A proper repair removes the tyre from the wheel so the inside can be inspected, then plugs and patches it from the inside, not just a string plug pushed in from outside.
When it can't be repaired
Some damage falls outside the safe repair zone entirely, and no reputable fitter will patch it:
- Sidewall or shoulder damage, which is never repairable.
- Holes larger than 6mm, or cuts and tears.
- Tyres below the legal tread limit anyway.
- Run-flats that have been driven while deflated.
The repair zone explained
The "repair zone" isn't arbitrary, it follows the structure of the tyre. The central three-quarters of the tread sits over a stiff steel-belt package that a proper patch-plug can bond to, restoring the tyre's strength. The outer shoulders and the sidewall flex far more and have no such reinforcement, so a repair there becomes a weak point that heat and flexing will eventually open up. That's why the rule is about where the damage is, not just how big it is: a 4mm hole in the centre is repairable, while the same hole in the shoulder is not.
Why a proper repair matters
A roadside string plug pushed in from outside isn't a permanent fix and isn't to standard. A correct repair, done to the method TyreSafe recognises, is cheaper than a new tyre and lasts the life of the tyre. We follow BS AU 159 on every repair, which is why we inspect the inside before signing it off, a step you simply can't do with the tyre still on the wheel.
Get it checked, not guessed
Our mobile puncture repair service comes to you across the UK. We'll inspect the tyre, repair it if it's safe, and tell you honestly if it needs replacing rather than risk a bad repair. Book a repair.
