In most of the USA, the legal minimum is 2/32 inch.
In most parts of the USA it is 2/32 of an inch.
The minimum tyre tread depth in the UK is 1.6mm.
2/32" on a standard passenger vehicle for most States in the USA, and that ain't much.
In most parts of the USA it is 2/32 of an inch.
Minimum tread depth for all 4 tires is 2/32"
If you mean tire tread depth, the minimum is 1.6mm.
All tires on vehicles driven in Missouri must be safe. There is no listed minimum tiretread depth or mention of tire grooving in the laws.
1.6 mm is the minimum
Minimum LEGAL tire tread depth is 2/32nds of an inch.
Most US states require a minimum of 2/32 of an inch (approximately 1.6 mm) of tread. If you intend to drive on wet roads 4 mm may be the minimum tread depth needed to stop and steer effectively. Without at least this much tread the tire cannot move water away from the tread fast enough to maintain adequate traction. To drive with less tread is not illegal until you reach the legislated minimums, but it may not be safe.
4/32nds of an inch
UK is 1mm