Puncture Repair or New Tyre? Here Is How to Decide.
Not every puncture means a new tyre. But some punctures definitely do. Here is the honest guide to when a tyre can be repaired and when it must be replaced — and why this matters.
The UK Standard for Tyre Repair: BS AU 159
In the UK, tyre repairs must comply with British Standard BS AU 159. This standard defines exactly when a tyre can be safely repaired and how the repair must be carried out. Any reputable tyre fitter — including TyreForce — will only repair tyres that meet these criteria.
When a Puncture CAN Be Repaired
A tyre can potentially be repaired if ALL of the following are true:
- Location: The puncture is in the central three-quarters of the tread (the minor repair zone). This excludes the shoulder and sidewall areas.
- Size: The puncture is no larger than 6mm in diameter.
- Driven distance flat: The tyre has not been driven significantly on flat (or if it has, there is no internal damage — this must be assessed by removing the tyre from the rim).
- Single repair: The tyre has not been previously repaired in a way that makes a second repair inadvisable (repairs should not overlap).
- No additional damage: There is no sidewall damage, bulging, or internal damage separate from the puncture.
A proper repair involves removing the tyre from the rim, inspecting the inside for damage, and fitting a mushroom plug through the injury — not just plugging from the outside. External-only plug repairs (done roadside) are a temporary measure and should be professionally inspected.
When a Puncture CANNOT Be Repaired
The tyre must be replaced, not repaired, if:
- The puncture is in the sidewall or shoulder area
- The puncture is larger than 6mm
- The tyre has been driven on flat and has internal damage
- The tyre has a sidewall bulge, even if unrelated to the puncture
- There are multiple punctures or the tyre has already been repaired in the affected area
- It is a run-flat tyre that has been driven on after the puncture
- The tread depth is below 1.6mm (legal limit) — no point repairing a tyre that needs replacing anyway
What About Tyre Foam / Sealant?
Many cars come with a can of tyre foam sealant as their only puncture contingency. This is a temporary measure only — and it comes with significant downsides:
- It does not work for sidewall punctures or blowouts
- It contaminates the inside of the tyre, often making subsequent professional repair impossible
- Some foam formulas damage TPMS sensors
- Once used, the tyre should be professionally inspected as soon as possible
If you've used sealant, tell your tyre fitter — they need to clean the tyre interior before attempting any repair.
Cost Comparison: Repair vs Replace
- Professional puncture repair: £25–£40 fitted
- Budget tyre replacement (standard size): £60–£90 fitted
- Mid-range tyre replacement: £85–£135 fitted
If the tyre can be repaired, it will always be significantly cheaper than replacement. TyreForce will always recommend repair over replacement if the tyre genuinely meets the criteria — we do not push unnecessary tyre sales.
What TyreForce Does When Assessing Your Tyre
When our technician arrives for a puncture callout, they will:
- Visually inspect the tyre — location of damage, tread depth, overall condition
- If repair appears possible, remove the tyre from the rim and inspect the inside
- Advise you clearly: repair or replace, and why
- Carry out the repair or replacement to BS AU 159 standard
No pressure, no upselling. Just an honest assessment and the right job done properly.