How to Check Tread Wear: The 4/32-Inch Safety Rule
To check tread wear, inspect every tire at the inner, center, and outer tread zones, then measure the lowest groove depth with a tread-depth gauge. A reading of 4/32 inch or less indicates substantially reduced wet-road reserve, while 2/32 inch is the common U.S. legal replacement threshold. Check tread condition, damage, and wear pattern together. […]