The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread, it being understood that the
pattern is repeated uniformly throughout the circumference of the tread;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof, the opposite side elevational
view being a mirror image thereof; and,
FIG. 4 is an enlarged fragmentary front view thereof.
In the drawings, the broken lines defining the tire inner bead, sidewall
and the peripheral boundary between the tire tread and the sidewall are
for illustrative purposes only and form no part of the claimed design.