The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of the tire tread of the present application;
FIG. 2 is a partial side view thereof; and,
FIG. 3 is a front view thereof.
The broken line and the region defining the inner bead and the sidewall depict subject matter that form no part of the claimed tire tread design, and are included for the purpose of illustrating the full tire. The tread pattern is understood to repeat uniformly throughout the circumference of the tire. The other side view is identical to the illustrated side view.