The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of tire tread in accordance with the present disclosure;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is an enlarged view of a portion of FIG. 2;
FIG. 5 is an enlarged perspective view of a portion of FIG. 4;
FIG. 6 is an enlarged perspective view of a portion of FIGS. 4; and,
FIG. 7 is an enlarged perspective view of a portion of FIG. 4.
It should be understood that the pattern repeats uniformly throughout the circumference of the tread. The lines defining the sidewall, 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.