How to Check Tyre Tread Depth: The 20p Test Explained
The 20p test is the quickest way to check if your tyres are legal. Here is exactly how to do it and what to do if your tyres fail the test.
Tyre tread depth is one of the most important aspects of road safety in the UK, yet many Bristol drivers have no idea how to check it properly. The legal minimum tread depth in the UK is 1.6mm across the central three-quarters of the tyre, across its full circumference. Driving with tyres below this limit can result in a fine of up to £2,500 and three penalty points — per tyre.
The 20p test is a simple and widely endorsed method for checking tyre tread at home. Take a 20 pence piece and insert it into the tread grooves of your tyre. If the outer band of the coin is hidden within the groove, your tread is likely above the legal minimum. If you can see the outer band clearly, your tyre may be at or below the legal limit and should be inspected by a professional immediately.
However, tyre safety experts — including the Bristol Mobile Tyre Guys — recommend replacing tyres when the tread reaches 3mm rather than waiting for the legal minimum. Wet stopping distances increase dramatically as tread depth drops below 3mm, and Bristol's roads can be wet for much of the year. At 1.6mm in wet conditions, stopping distances are 44% longer than at 3mm.
If your tyres fail the 20p test, do not delay. Call Bristol Mobile Tyre Guys for a fast, convenient tyre replacement at your home or workplace. We carry a wide range of tyre sizes and can have you back on the road with safe, legal tyres within the hour. Do not risk your safety or a hefty fine on worn rubber — let us sort it for you.
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