The ornamental design for a tread of a tire, as shown and described.
FIG. 1 is a perspective view of the tire tread of the present invention, it
being understood that the pattern is repeated uniformly throughout the
circumference of the tread,
FIG. 2 is an elevational view of the tire tread shown in FIG. 1; and,
FIG. 3 is a side view of the tire shown in FIG. 1.
The broken lines showing the tire inner bead and sidewall in the figures
are for illustrative purposes only and form no part of the claimed design.