Driving on tyres below the legal tread depth carries a fine of up to £2,500 per tyre. Find out the legal limits, how to check your tread, and when to replace your tyres.
In the UK, the minimum legal tyre tread depth for cars, vans, and light trailers is 1.6mm, measured across the central three-quarters of the tyre's width and around its full circumference. Driving below this limit is a criminal offence and can result in a fine of up to £2,500 and three penalty points for each non-compliant tyre.
A simple way to check tread depth is the 20p coin test. Insert a 20p coin into the main tread grooves at several points around the tyre. If the outer band of the coin is visible above the tread surface, your tread may be at or below the legal minimum and the tyre should be inspected professionally.
Most tyres also feature tread wear indicators — small raised sections moulded into the base of the main tread grooves. These indicators become flush with the surrounding tread surface when depth reaches 1.6mm, providing a clear visual signal that replacement is due.
Safety experts recommend replacing tyres at 3mm rather than waiting for the legal minimum, as wet-weather braking distances increase noticeably below this level. Glasgow Mobile Tyre Guys can check your tread depth during any service visit and advise on the most appropriate course of action for your tyres.
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