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 is repeated uniformly throughout the circumference of the tread;
FIG. 2 is a front view thereof; the top plan view and the bottom plan view are identical.
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof; the right side view is a mirror image of this view; and,
FIG. 5 is an enlarged fragmentary view from upper A to lower A.
The broken lines illustrate environmental subject matter only and form no part of the claimed design.