FIG. 1 is a perspective view of a tire tread in accordance with the invention; FIG. 2 is a front elevation view thereof; FIG. 3 is a partial front elevation view thereof, shown at an enlarged scale; FIG. 4 is a side elevation view of inside of the tire tread; and, FIG. 5 is a side elevation view of outside of the tire tread. The broken lines depict environmental subject matter only and form no part of the claimed design.