veh-tire-tread-depth-requirements

Federal tire tread depth requirements under 49 CFR § 393.75 mandate 4/32 of an inch for steer axle tires and 2/32 of an inch for drive and trailer tires to pass DOT compliance and roadside inspections.

To measure tire tread depth correctly for DOT inspections, use a tread depth gauge at specific inspection points across the tire. The Skill guides you through proper measurement procedures and what FMCSA inspectors evaluate during roadside checks.

Yes, 49 CFR § 393.75 sets axle-specific tread depth limits requiring steer tires to maintain 4/32 of an inch minimum tread depth, while drive and trailer tires require a minimum of 2/32 of an inch for compliance.

Yes, 49 CFR § 393.75 includes special tire tread requirements for vehicles hauling hazardous materials. The Skill explains these specific hazmat compliance standards alongside general commercial vehicle fleet safety inspection criteria.

You should replace commercial tires before tread depth drops below the 4/32 inch steer axle or 2/32 inch other axle minimums. The Skill supports fleet tire maintenance decisions and DVIR checks to prevent DOT violations.