The ornamental design for a tread of a tire, as shown and described.
FIG. 1 is a perspective view of the tread of a tire of the present
invention, it being understood that the pattern is repeated uniformly
throughout the circumference of the tread; and,
FIG. 2 is an elevational view of the tread of a tire shown in FIG. 1.
The broken line showing the tire inner bead and sidewall is for
illustrative purposes only and forms no part of the claimed design.
In the drawings, the dark stippled surface shading represents the recessed
portion of the tread grooves, having a depth as best shown in FIG. 2.