What is the minimum depth of tires?

The minimum tread depth for tires is typically 2/32 of an inch (1.6 mm) in the United States, which is the legal limit for safe driving. However, many experts recommend replacing tires when the tread depth reaches 4/32 of an inch (3.2 mm) to ensure optimal traction, especially in wet conditions. Using a penny or quarter can help gauge tread depth; if you can see the top of Lincoln's head or Washington's head, it's time for new tires.