The ornamental design for a tire tread, as shown and described.
FIG. 1 is a top plan view of a tire tread showing our new design which has
been broken away in the middle to indicate indeterminate length, it being
understood that the head pattern is repeated uniformly throughout the
length of the tread;
FIG. 2 is a side elevational view thereof; and
FIG. 3 is an end elevational view thereof looking in the direction of the
arrows on line 3--3 of FIG. 1.