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Question:

A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.

A 2/32 of an inch
Explaination

For safe operation, a commercial motor vehicle needs a tread depth of 4/32 of an inch in every major groove on the front tires, and a tread depth of 2/32 of an inch on other tires.