What is the minimum tread depth requirement for tyres used on vehicles first manufactured after 1933?

The minimum tread depth requirement for tyres on vehicles first manufactured after 1933 is 1.6mm. This standard applies to vehicles that need this specific tread depth within the central three-quarters of the tread's breadth and around the entire outer circumference of the tyre. It's important to note that these regulations are in place to ensure safe driving conditions and provide optimal traction, especially during adverse weather or road conditions.