The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view thereof.
FIG. 2 is a front view. Top, bottom, and rear views each are identical to this front view.
FIG. 3 is a left side view. The right side view is identical; and,
FIG. 4 is an enlarged fragmentary view between the lines 4-4 provided in FIG. 2.
In the drawings, the broken lines depict portions of the tire that form no part of the claimed design. The dash-dot-dash lines define the bounds of the claimed design and form no part thereof. The surface shading lines and stippling in the drawings depict the character or contour of the surfaces represented and form no part of the claimed design.