Puncture repair methods are not interchangeable, and picking the wrong one is a common cause of repairs that fail early — or that shouldn't have been attempted at all. Here's how the main methods differ and when each is appropriate.
Plug (string) repairs
A rope-style plug, like our 12in tyre repair strings, is inserted from the outside of the tyre into the puncture channel without demounting the tyre from the rim. It's fast, which is exactly why it's tempting — but it only seals the tread from the outside and does nothing to inspect or seal the inner liner.
Appropriate for: a genuine roadside or temporary fix, or low-severity punctures in the central tread area, where a full repair will follow properly at the earliest opportunity.
Not appropriate for: a permanent repair on its own. Most tyre industry guidance does not consider a plug-only repair adequate as a final fix, because it can't be inspected from inside and doesn't address any damage to the tyre's internal structure.
Patch repairs
A proper patch is applied from inside the tyre after demounting, over a puncture that's been reamed, buffed and cleaned. Our Rema Tip Top RAD110 radial patches are a standard inside-patch format for radial tyres.
Why it's the more thorough method: demounting the tyre lets you inspect the whole inner liner for damage that isn't visible from outside — sidewall cord damage, secondary punctures, or wear that would make repair unsafe regardless of the puncture itself.
Appropriate for: punctures in the repairable zone (broadly the central tread area — check current guidance for exact limits), where the hole diameter and tyre condition fall within safe repair limits.
Combination patch-plug repairs
A combination repair unit has a plug section that fills the puncture channel and a patch section that bonds to the inner liner in one unit — widely considered the most thorough method for tread-area punctures, since it addresses both the channel and the liner in a single, properly bonded repair, without needing a plug fitted from outside and a separate patch from inside.
What can't be repaired
Regardless of method, some damage means a tyre should not be repaired at all:
- Damage in the shoulder or sidewall area — repair is generally not considered safe here, only within the central tread zone.
- Punctures above the size limit for the repair method being used.
- Multiple punctures too close together.
- Any sign of internal structural damage — visible cord, bulging, or heat damage from prior underinflation.
- A tyre that has been run flat or significantly underinflated, even briefly — internal damage isn't always visible from outside.
When in doubt, the tyre gets replaced, not repaired. This isn't overcaution — it's the standard professional position, and it's what protects you as the fitter as much as the driver.
Don't forget the valve
Any time a tyre is demounted for a proper patch or combination repair, it's standard practice to fit a new valve rather than reuse the old one — see our TR414 snap-in valves. Valves are cheap relative to a comeback for a leak at the valve stem.
Browse the full tyre consumables range for patches, plugs, sealant and valves.
