When is a tyre safe to repair?

Safety Seal Repair Plug repairs tyre punctures so they are permanently airtight. Unfortunately though, some damage is beyond repair.

Make sure you check the following:

  • Legal tread depth (min 1.6mm across the central 3/4 of the tyre tread around the entire circumference).
  • Damage due to driving whilst flat - visible through for example a dark line on the side (see example image at bottom left).
  • Secondary damage - caused by the damaged items. An internal inspection should be carried out to check for this.
  • Ageing/deterioration of the tyre rubber.
  • Puncture outside the repairable area (1 in the figures), e.g. on the sidewall.
  • Damaged bead (3 in the figure).
  • Exposed cords from steel belt(s).
  • Improper/poor quality previous repairs.

If the tyre has experienced any of the above, it should not be repaired. The above list is not exhaustive. Inspection is important and common sense should be used if you have doubts about whether a tyre should be repaired.

The number of repairs that can be carried out on a tyre is determined by speed class. There is also a limit to how large the puncture hole can be. See the table below:

Tyre type Speed class Max hole size Max no. repairs
Car All 6mm No limit
Truck/Bus All 9mm No limit
Motorbike Up to J 6mm Max 2
Over J 3mm Max 1

Please contact us if you have any questions or would like further information.

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