Most are in mm or /32 of an inch.
It is the depth of the grooves in the tyre.
If you mean tire tread depth, the minimum is 1.6mm.
That depth present on a new tyre.
Minimum LEGAL tire tread depth is 2/32nds of an inch.
The minimum tyre tread depth in the UK is 1.6mm.
The average tread depth of a new radial tire is typically around 10/32 to 11/32 of an inch. This tread depth provides good traction and performance while allowing for gradual wear over the lifespan of the tire.
Purchase a tread depth gauge from your local auto parts store. It will measure in 1/32" increments. Take measurements at the inside, middle and outside of tire treads.
UK is 1mm
It is the rubber marker within the tread to show tread depth. It is also known as a tread wear indicator
IC 9-19-18 - Indiana does not have a legal tire depth law... Most states list 2/32 as the limit.
The minimum tire tread depth for a car is typically 2/32 of an inch (1.6 mm) in the United States. However, many safety experts recommend replacing tires when the tread depth reaches 4/32 of an inch to ensure better traction, especially in wet conditions. Regularly checking tire tread depth can help maintain optimal performance and safety.
LGV's must have a tread depth of at least 1mm across 3/4 of the breadth of the tread and in a continuious band around the entire circumference