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Tread depth in the major grooves on a front tire should be at least

A 4/32 of an inch
Tires need to have at least 4/32 of an inch of tread depth in every major groove on the front tires, and at least 2/32 of an inch of tread depth on other tires. more
B 3/4 of an inch
C 1/2 of an inch
D 1/16 of an inch