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 is repeated throughout the circumference
thereof;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof; and,
FIG. 4 is an enlarged fragmentary front view thereof.
In the drawings, the broken line showing of the tire sidewall and the solid
line defining the peripheral boundary between the tire tread and the
sidewall are for illustrative purposes only and form no part of the
claimed design.