The legal minimum tyre tread depth in the UK is 1.6mm across the central three-quarters of the tread around the full circumference of the tyre. Driving below this limit is a criminal offence that carries a fine of up to £2,500 and three penalty points per tyre — meaning a car with four illegal tyres could result in a £10,000 fine and twelve penalty points. It also invalidates your vehicle insurance in the event of an accident.
How to Check Your Tread Depth
The quickest check uses a 20p coin. Insert the coin into the main tread groove of your tyre. If the outer band of the 20p coin — which is approximately 1.6mm deep — is visible, your tyre is at or below the legal minimum and must be replaced immediately. Check multiple points around the tyre circumference and across the width of the tread, as uneven wear may mean some sections are more worn than others. For an accurate measurement, use a dedicated tread depth gauge available from any motor retailer for around £5.
Why 1.6mm Is the Minimum, Not the Target
The 1.6mm limit is the legal floor, not a recommended replacement point. Tyre safety organisations and most manufacturers recommend replacing tyres at 3mm. Testing by organisations such as TyreSafe has demonstrated that the increase in wet braking distances between 3mm and 1.6mm can be the difference between stopping safely and a collision. Many new tyres come with wear indicator bars moulded into the tread grooves — these become flush with the tread surface at 1.6mm, providing a visible warning.
Getting Your Tyres Checked in Glasgow or Bradford
If you are unsure about your tread depth, call Energy Mobile Tyres on 0141 673 6841. We can visit you in Glasgow or Bradford for a free tyre check and provide honest, no-obligation advice about whether replacement is needed. If new tyres are required, we can fit them on the spot the same day.
