Not every puncture means a new tyre. We explain when a mobile puncture repair is safe and when a full tyre replacement is the only option — with BS AU159 guidelines.
A nail or screw in your tyre doesn't always mean you need a new one. In many cases, a proper mobile puncture repair — done to BS AU159 standards — will restore the tyre to safe, roadworthy condition. The key is knowing when it's safe to repair and when replacement is mandatory.
When Can a Puncture Be Repaired?
A tyre can be repaired if ALL of the following apply:
- The puncture is in the central three-quarters of the tread
- The hole is 6mm in diameter or smaller
- The tyre has not been run flat (driven while deflated)
- There is no secondary damage to the tyre structure
- Tread depth is sufficient after repair
When Must the Tyre Be Replaced?
Replacement is required if:
- The puncture is in the sidewall or shoulder area
- The tyre was driven on while flat
- The damage is larger than 6mm
- Multiple punctures are within 40cm of each other
- The tyre is a run-flat type (run-flats cannot be safely repaired)
The BS AU159 Standard
BS AU159 is the British Standard for tyre repair. It specifies that a proper repair involves removing the tyre from the rim, inspecting the inside, applying a combination plug and patch from the inside, and re-fitting. A plug-only repair from outside — with a spiral plug or string repair — does not meet BS AU159 and should not be used.
All puncture repairs carried out by Totally Mobile Tyres are performed to BS AU159 standards. We never do quick plug-only fixes that compromise your safety.
