The ornamental design for a tire tread, as shown and described.
FIG. 1 is a front elevation view of a tire tread showing our new design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a front, right perspective view thereof; and,
FIG. 5 is an enlarged partial front elevation view thereof.
The square boundary shown with the dot-dash broken line in FIGS. 1 and 5 is for the purpose of illustrating demarcation of the enlarged view of the tire tread and forms no part of the claimed design.
The other broken line showing is for the purpose of illustrating unclaimed portions of the tire tread and forms no part of the claimed design.
The tread pattern repeats uniformly throughout the circumference of the tire.