What are the puncture repair rules — what's legal to fix?

UK puncture repair guidelines

UK tyre repairs must comply with British Standard BS AU 159, which outlines the parameters for safe repair.

Legal repair criteria

• Punctures located centrally in the tread (within three-quarters of the tread width)
• Holes no greater than 6mm in diameter
• The tyre has not been used when flat or with insufficient pressure
• No secondary damage to the sidewall or structural components
• Repairs must be combination plug-and-patches that are done from the inside of the tyre

Plug repairs done from the outside of the tyre do not meet the British Standards guidelines for safe and permanent repairs.