Maine Revised Statutes Title 29-A. Motor Vehicles § 1917. Tires and wheels

A. “Tread depth” means the amount of tread design on the tire. “Tread depth” includes original, retread and recap tread design and, in respect to a special mileage commercial tire, recut, regrooved and siped tread design.

B. “Special mileage commercial tire” means a tire manufactured with an extra layer of rubber between the cord body and original tread design, which extra layer is designed for the purpose of recutting or regrooving, and which tire is specifically labelled as a “special mileage commercial tire.”

A. A fabric break or a cut in excess of one inch in any direction as measured on the outside of the tire and deep enough to reach the body cords;

B. A temporary repair by the use of blowout patches or boots;

C. A bump, bulge or knot related to separation or partial failure of the tire structure;

D. A portion of the ply or cord structure exposed; or

E. Sidewalls damaged to the extent that the body cords are damaged.

A. Tire tread depth must be measured by a tread depth gauge that is calibrated in 1/32 inch.

B. Readings must be taken in all major tread grooves and must include at least 2 points not closer than 15 inches.

C. Readings for a tire that has the tread design running across the tire or for a siped tire must be taken at or near the center of the tire at 2 points of the circumference not closer than 15 inches.