A Proper Tractor-trailer Wheel And Tire Inspection — Conducting

Minimum depth of 2/32 inch . These may be retreads as long as they meet depth and integrity requirements. 2. Measure Cold Tire Pressure

Federal law mandates specific tread depths for different axles. Use a tread depth gauge for accurate measurements in several major grooves: Minimum depth of 2/32 inch

Minimum depth of 4/32 inch . These tires must be brand new and cannot be retreads. Minimum depth of 2/32 inch

Relying on a "thump test" is unreliable. Always use a calibrated pressure gauge while the tires are cold—meaning the vehicle has been stationary for at least 3 hours. Proper Pre-trip Tire Check Minimum depth of 2/32 inch