The 20p test
Put a 20p coin into the main tread grooves. If you can see the outer band of the coin, your tread may be close to or below the legal limit. Check in a few places on each tyre.
Don't wait for 1.6mm
Grip in the wet drops off as tread wears down, well before the legal limit. Many experts recommend changing tyres at around 3mm. Need new ones? We'll fit them at your home or work.
Common questions
Does the 1.6mm limit apply to vans?
Yes. Cars, light vans and light trailers all have the same minimum: 1.6mm across the central three-quarters of the tread, all the way round.
Is the fine per tyre?
Yes. The fine of up to £2,500 and 3 penalty points can apply for each illegal tyre.
Written by Harsh at True Tyre Mobile Service, a mobile tyre fitter with 4.5 years' experience. This is general advice; always follow your vehicle handbook.