The ornamental design for a tread for a tire, as shown and described.
FIG. 1 is a perspective view of a tread for a tire showing my new design,
it being understood that the tread pattern is repeated throughout the
circumference of the tread for a tire and that the opposite side
perspective view is identical thereto; and,
FIG. 2 is an elevational view of the tire tread design shown in FIG. 1.
The broken lines defining the tire 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.