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Question:

The minimum acceptable tread depth for rear tires is:

A 2/32 of an inch.
Explaination

When inspecting your tires, verify that there is at least 4/32 of an inch of tread depth in every major groove on the front tires, and tread depth of at least 2/32 of an inch on the other tires. Tires on the same vehicle should all be the same size.