The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing my new design, it being understood that the tread pattern repeats circumferentially throughout the outer circumference and shoulder of a tire, the opposite side perspective view being an inverted image thereto; and,
FIG. 2 is an enlarged fragmentary front elevation view of the tire tread thereof of FIG. 1, wherein the tire tread segment shown has a convex curvature bounded at the top and bottom by cuts in radial planes.
In the drawings, the dark stippled surface shading represent the recessed groove portions of the tire tread having a depth as best illustrated along the right edge of FIG. 1. The broken line disclosure of the tire sidewall and inner bead is for illustrative purposes only and forms no part of the claimed design.