The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing my new design, it
being understood that the tread pattern is repeated uniformly throughout
the circumference thereof;
FIg. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof, it being understood that the
opposite side is a mirror image of that shown; and,
FIG. 4 is an enlarged fragmentary front elevational view thereof.