The ornamental design for tire tread, as shown and described.
FIG. 1 is a perspective view of the design;
FIG. 2 is a front view of the design of FIG. 1;
FIG. 3 is a side view of a first side of the design of FIG. 1;
FIG. 4 is a side view of a second side of the design of FIG. 1; and,
FIG. 5 is a detail view of a portion of FIG. 1.
In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design.
Attachment A includes a set of drawings showing additional details relating to the design shown in FIGS. 1-5, but the content of Attachment A forms no part of the claimed design.