The ornamental design for a tire tread, as shown and described.
FIG. 1 is a front elevational view of a tire tread it being understood that
the tread pattern repeats uniformly throughout the circumference of the
tread;
FIG. 2 is a left side elevational view thereof; and,
FIG. 3 is a right side elevational view thereof.
In the drawings, the broken lines defining the tire sidewall, the raised
lettering and the peripheral boundary between the tire tread and the
sidewall are for illustrative purposes only and form no part of the
claimed design.