I claim the ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread, according to the invention, it being understood that the tread pattern repeats uniformly throughout the outer circumference of the tire and the carcass portion of the tire located radially inwardly of the tread forms no part of the design;
FIG. 2 is a front elevational view of the tire tread, according to FIG. 1; and
FIG. 3 is a side elevational view of the tire tread, according to FIG. 1, the opposite side elevational view being identical thereto; and,
FIG. 4 is an enlarged view of the portion of the tire tread shown in FIG. 2.
In the drawings, the broken lines defining the sidewall and inner bead and the peripheral boundary between the tire tread and the sidewall depict environmental subject matter only and form no part of the claimed design.