The 20p Test
Another easy way to measure the depth of the tread. You can use the quick and simple 20p test. Insert a 20p coin into the lowest tread depth of your tyres. If you can’t see the outer rim around the edge of the coin, then your tyre is safe and has a minimum of 3mm tread depth. If you CAN see the rim then your tyre tread is less than 3mm and should be checked by a professional.
In an ideal world, you should check your tyre’s tread depth and pressure at least once every two weeks, and at the very least once a month. Safe and correct tyre treads are vital especially when travelling on long journeys and on motorways.
More tread means more grip. It's as simple as that. Be aware that even though the legal limit is 1.6mm, anything under 3mm can seriously compromise performance and safety.
In wet weather tyre tread grooves help to remove water from the contact patch between your tyres and the road surface meaning your car can brake, steer and accelerate properly.
Without adequate tread depth, your tyres may not be able to perform properly in wet conditions, reducing your safety on the road. It is therefore advisable to consider replacing your tyres well before they reach the legal minimum.
For safety reasons, it is recommended that you replace your tyres before the legal limit is reached. Many vehicle manufacturers recommend replacing at 3 millimeters. It’s always better to be safe than sorry!
Furthermore, drivers whose tyres fail to comply with the minimum tread depth requirements risk a fine of up to £2,500 and three penalty points for each illegal tyre
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