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 directional & symmetrical tread pattern repeats circumferentially throughout the outer circumference and shoulder of a tire, the opposite side perspective view being an inverted image thereto;
FIG. 2 is an enlarged fragmentary front elevation view of the tire tread thereof of FIG. 1; and,
FIG. 3 is a side elevation view of the tire tread of FIG. 1, the opposite side elevation view being a mirror image thereto.
The broken line disclosure of the tire sidewall and inner bead is for illustrative purposes only and forms no part of the claimed design.