The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of the tire tread of our design;
FIG. 2 is a front elevation view of the tire tread of our design;
FIG. 3 is a side elevation view of the tire tread of our design;
FIG. 4 is a side elevation view of the tire tread of our design, taken from the opposite side of that shown in FIG. 3; and,
FIG. 5 is an enlarged, partial view of FIG. 1.
In the drawings, the broken lines defining the sidewall and inner bead depict environmental subject matter that forms no part of the claimed design. The dash-dot-dot-dash line defines the peripheral boundary between the claimed tire tread and the unclaimed sidewall. The tread pattern repeats uniformly throughout the circumference of the tire.