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 over the outer circumference of the tread width and the adjacent shoulders of the tire, the opposite side perspective view being identical thereto; and,
FIG. 2 is a front elevation view of the tread pattern of FIG. 1.
In the drawings, the dark stippled surface shading represents the recessed portion of the tread grooves having a depth as best shown in FIG. 1. The broken line disclosure of a tire sidewall and inner bead and the peripheral boundary between the tire tread and sidewall are for illustrative purposes only and form no part of the claimed design.