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Puncture Repair: When Can It Be Done & Is It Safe?

A puncture is a pain in the neck - and the wallet. But before you pay for a whole new tyre, it's worth knowing when a puncture can be safely repaired instead.

Updated July 20266 min read

When a puncture CAN be repaired

  • The puncture must be within the central three-quarters - the "minor repair area"
  • The damage must be no larger than 6mm in diameter
  • The tyre must be above the 1.6mm legal tread limit and otherwise sound
  • Sidewall and shoulder punctures, and run-flats driven flat, generally can't be repaired

Is a puncture repair safe?

Done properly, yes. A professional puncture repair carried out to the British Standard (BS AU 159) is a safe, cost-effective alternative to replacing the tyre. The repair is done from the inside using a combined plug-and-patch specifically designed for the job - not a quick external plug.

When can a puncture be repaired?

A puncture can only be repaired if it sits within the minor repair area and is no more than 6mm across. Anything larger, or outside that zone, means the tyre must be replaced.

The minor repair area

The minor repair area is the central three-quarters of the tread. A puncture within this band can usually be repaired. The outer edges - the shoulders and sidewall - are the major repair area.

The major repair area

A puncture in the shoulder or sidewall (the major repair area) cannot be safely repaired. The sidewall flexes constantly as you drive, so a repair there can't be trusted - the tyre must be replaced.

When a tyre can't be repaired

  • The puncture is in the sidewall or shoulder
  • The damage is larger than 6mm
  • Tread is below the 1.6mm legal limit, or there are bulges or exposed cords
  • It's a run-flat tyre that has been driven on while flat

Before any repair, we inspect the tyre inside and out. If it isn't safe and road-legal after repair, we won't patch it up - we'll be straight with you and recommend a replacement.

“We'll always try to repair before we sell you a new tyre. If it's a small nail in the middle of the tread and the tyre's sound, a proper internal repair is safe and a fraction of the cost. But we won't repair something that isn't safe, no matter how much cheaper it is for the customer.”

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Aaron Duncan
Owner, Grangetown Tyres

How a professional puncture repair is done

  1. The wheel is removed and the tyre taken off the rim
  2. The tyre is inspected inside and out for hidden damage
  3. The puncture is prepared and a combined plug-patch fitted from the inside to BS AU 159
  4. The tyre is refitted, inflated to the correct pressure and the wheel is re-balanced
A Grangetown Tyres fitter carrying out a puncture repair

Sources & further reading

Frequently asked questions

Is a puncture repair safe?

Yes, when carried out to the British Standard (BS AU 159). The puncture must be in the central three-quarters of the tread, no larger than 6mm, and the tyre must otherwise be sound.

Can a run-flat tyre be repaired?

Generally no. A run-flat that has been driven on while flat should be replaced rather than repaired.

Can I plug a tyre myself?

An external plug is only a temporary get-you-home measure. A safe, permanent repair is done from the inside with a plug-patch by a professional.

How long does a puncture repair take?

A professional repair typically takes around 20-30 minutes, and we can do it at your home or work.

Need tyres sorted? Let's get you moving.

Call now for a fast, no-obligation quote - or drop your details in and we'll come back to you.

07772 078 648

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