What is the minimum legal tread depth for tires in Michigan?

• A. 4/32 of an inch.
• B. 3/32 of an inch.
• C. 2/32 of an inch; replace tires when tread is worn to this depth.
• D. 5/32 of an inch.

Answer: (C)

The key idea is that there is a legal limit for how worn tires can be, to ensure enough grip on the road. In Michigan, the minimum tread depth allowed by law is 2/32 of an inch. When tread wears down to that depth, tires must be replaced to maintain safe traction, especially on wet pavement where the tire’s ability to channel water is reduced.

To check your tires, you can use a tread depth gauge or a simple penny test. For the penny test, insert Lincoln’s head into the tread with the head upside down; if you can see the top of Lincoln’s head, the tread is at or below 2/32 inch and the tire should be replaced. Many drivers prefer more tread for safety, but the legal minimum remains 2/32 inch.