The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing our new design, it
being understood that the pattern repeats uniformly throughout the
circumference of the tread;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof; and,
FIG. 4 is a side elevational view of the opposite side.
In the drawings, the broken lines defining the inner bead of the 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.