How to make sure your tyres are legal
Published: 16 July 2009
As well as inflating them correctly, the Law says that the grooves of the tread pattern must have a depth of a least 1mm throughout a continuous band measuring at least three-quarters of the breadth of the tread and round the entire outer circumference of the tyre.
As quite a few bike tyres have grooves that don't extend beyond three-quarters of the breadth of the tread any groove of the original pattern must have a minimum depth of at least 1mm.
That's the absolute minimum and 2mm is when we'd change our rubber as the tyre's profile will have altered by then.
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