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 tread pattern is repeated uniformly throughout the circumference of the tire tread, as shown schematically in solid lines.
FIG. 2 is an enlarged fragmentary front elevational view thereof; and,
FIG. 3 is a side elevational view of the design of FIG. 1, the opposite side elevational view being identical thereto.
In the drawings, the broken lines defining the sidewall, inner bead and the peripheral boundary between the claimed tire tread and the unclaimed sidewall depict environmental subject matter that forms no part of the claimed design.