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
tread pattern repeats uniformly throughout the circumference of the tire
tread;
FIG. 2 is a front elevational view thereof; and,
FIG. 3 is a side elevational view thereof, the opposite side elevational
view being identical thereto;
The broken line showing of the tire sidewall in the drawings is for
illustrative purposes only and forms no part of the claimed design.