Should be almost 1/4 inch new. Most will be good in snow to 1/8 inch, less than that is not much good.
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.
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.
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.
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
1.6 mm is the minimum
1/32