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 pattern repeats uniformly throughout the circumference of the tread;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof; the opposite side being a mirror image thereof; and,
FIG. 4 is a fragmentary front view, showing the tread pattern in greater details; and,
FIG. 5 is a cross-sectional view taken along line5—5 and in the direction of arrows in FIG. 4.
The broken line showing of environment is for illustrative purposes only and forms no part of the claimed design.