Also what's an acceptable level of tread depth on a tyre before it has to be changed.
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Depends who you ask. MOT man wants to see a minimum of 1mm over 75% (I think) of the tread area.
3.
(i) the tread pattern is not clearly visible over the whole tread area. (see information column)
(ii) The depth of 1 mm throughout a continuous circumferential band measuring at least three quarters of the breadth of the tread. (see information column).