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 is repeated over the outer circumference and shoulder of the tire, the opposite side perspective view being identical thereto; and,
FIG. 2 is an enlarged fragmentary front elevation view of the tread pattern of FIG. 1 showing my new tread pattern for the tire tread.
The broken line disclosure of the tire sidewall and inner bead is for illustrative purposes only and forms no part of the claimed design. In the drawings, the dark stippled shading in the groove area of the tread surface represents the recessed portion of the tread grooves, having a uniform depth best illustrated by the top and bottom boundaries of FIG. 2.