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4 mm
2.5 mm
1.6 mm
1 mm
Explanation: The law says that the entire original tread must be visible, with a depth of at least 1 mm in a continuous band across at least three-quarters of the breadth of the tread. However, your tyres are your only contact with the road, so it's recommended that you replace them before they get to this level.
Category: Safety and your motorcycle
References: The Official DVSA Guide to Riding: Section 15, Highway Code: Page 129
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