what's the legal minimum depth of tread for car tyres?

The legal minimum tread depth for car tyres in the UK is 1.6 millimetres across the central three-quarters of the tyre's tread around the entire circumference. This ensures the tyre remains roadworthy and safe to use. Although 1.6mm is the legal limit, experts recommend replacing tyres sooner, often at around 3mm, for optimal safety and performance, especially in wet conditions where tread depth significantly affects braking distance and grip.