The minimum tread depth required for car tyres is generally 1.6 mm across the central three-quarters of the tyre's tread and around its entire circumference. This is the legal standard for summer tyres and regular car tyres in many regions including the UK and Europe. However, experts often recommend replacing tyres earlier, around 3 mm of tread depth, for better safety, especially in wet conditions where more tread depth significantly improves brake performance and grip. For winter tyres, the minimum tread depth requirement is higher, typically at least 4 mm, to ensure adequate performance in snow and icy conditions. Vehicles weighing more than 3,500 kg have higher minimum requirements, such as 6 mm for winter tyres. Summary:
- Minimum legal tread depth for car tyres: 1.6 mm (summer/regular tyres).
- Recommended tread depth for safety: 3 mm.
- Minimum tread depth for winter tyres: 4 mm.
- Vehicles over 3,500 kg have higher tread depth requirements.
These requirements apply to the main tread area, ensuring the tyre remains roadworthy and safe to use.
