The tires on all other wheel positions must have a tread depth of at least 1/32 when measured in any two adjacent grooves at three separate locations at least 8 in. According to CVSA, if the tread depth on a steer tire is less than 2/32 of an inch in two adjacent grooves, then the vehicle is placed out of service until the tire is replaced. On the other hand, the Commercial Vehicle Safety Alliance (CVSA) has a completely different rule regarding the minimum tread depth on steer tires. It’s also important to note that the tread depth measurements cannot be taken at the wear indicators or stone ejectors in the grooves. These same rules apply to drive and trailer tires, but the minimum tread depth is 2/32 of an inch in every major groove. It can theoretically be worn away and the tire will remain in compliance as long as the major grooves are 4/32 when measured anywhere on the tire and there are no other conditions that warrant a violation. The thin decoupling groove at the shoulder, however, is not a major groove.
#TIRE DEPTH GAUGE CHART DRIVER#
If one spot on one groove is less than 4/32, then a driver will be issued a citation.
FMCSA regulationĪccording to Federal Motor Carrier Safety Administration (FMCSA) regulations, the minimum tread depth for a steer tire is 4/32 of an inch on every major tread groove. One area that seems to surface quite often is minimum tread depth. There seems to be some varying interpretations of the federal regulations on truck tire and wheel inspection, so I thought it was time to dedicate this month’s column to help clear up some of the confusion. If I had a quarter for every phone call that started with the words, “My customer got a ticket for…,” I would have a whole bunch of quarters.
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