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; and,
FIG. 3 is a side elevational view thereof on a reduced scale.
The broken line showing of the tire sidewall in FIGS. 1 and 3 of the
drawing is for illustrative purposes only and forms no part of the claimed
design.