The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of the tire tread according to the present design, it being understood that the tread pattern is repeated throughout the circumference of the tire tread;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left lateral view thereof;
FIG. 5 is a right lateral view thereof; and,
FIG. 6 is an enlarged fragmentary rear view showing the details of the tread portion thereof.
The broken lines defining the sidewall, inner bead, and the peripheral boundary between the claimed tire tread and the sidewall depict environmental subject matter that forms no part of the claimed design. The uneven dashed lines in FIG. 6 define the bounds of the enlarged fragmentary rear view of the claimed design and form no part of the claimed design.