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 an side view thereof; and
FIG. 3 is a front view thereof; and,
FIG. 4 is an enlarged fragmentary view of FIG. 1 thereof.
The broken lines and the region therebetween defining the inner bead and the sidewall depict subject matter that forms 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.