The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing his new design, it being understood that the tread pattern is repeated throughout the circumference of the tire, and that the opposite perspective view is identical thereto;
FIG. 2 is a side view of the tire tread illustrated in FIG. 1, it being understood that the right side and left side views are identical; and,
FIG. 3 is a front view of the tire tread illustrated in FIG. 1, it being understood that the front view and rear views are identical.
In the drawings, the dark stippled shading represents the recessed portions of the tread design having a height as best shown along the right edge of FIG. 1. The broken line disclosure of a tire sidewall portion and inner bead is for illustrative purposes only and forms no part of the claimed design.