The Legal Minimum Tread Depth
In the UK, car tyres must have a tread depth of at least 1.6mm across the central three-quarters of the tyre, all the way around. Below that it is illegal, an MOT failure, and you risk a fine and penalty points per tyre.
An easy home check is the 20p test: slot a 20p coin into the main grooves. If the outer band of the coin is hidden, you are above the limit. If you can see it, your tyres are likely below 1.6mm and should be checked.
Why Many Drivers Change Earlier Than 1.6mm
Grip, and especially wet braking, drops off well before the legal limit. Many drivers and manufacturers suggest replacing at around 3mm for the best balance of safety and value. On wet Hampshire roads in winter, that extra tread makes a real difference to stopping distances.
Warning Signs to Act On
Beyond tread depth, look out for:
- Cracking or perishing in the sidewall rubber
- Bulges or lumps, which can mean internal damage
- Uneven wear across the tyre (often an alignment issue)
- Vibration through the steering wheel
- Tyres more than around 7–10 years old, whatever the tread
Not sure? Pop in for a free check
If you are unsure, bring the car to us in Hedge End and we will check the tread and condition for free, and tell you honestly whether they need doing. We will never sell you tyres you do not need.
Need a hand with your tyres?
Pop in to our Hedge End workshop or give us a call for honest, no-obligation advice.