The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing our new design, it being understood that the tread pattern repeats uniformly throughout the outer circumference and shoulder of a tire;
FIG. 2 is a front elevation view thereof, the top and bottom views being identical thereto;
FIG. 3 is a right side elevation view thereof; the opposite side elevational view being identical thereto;
FIG. 4 is an enlarged, fragmentary front view thereof, taken along lines 4-4 and in the direction of arrows in FIG. 2; and,
FIG. 5 is a cross-sectional view of a part taken from the 5-5 line in FIG. 4, which shows only a cutting section.
In the drawings, the broken line disclosure of the tire sidewall and inner bead depicts environmental subject matter that forms no part of the claimed design.