The ornamental design for a shoulder tread for a tire, as shown and described.
FIG. 1 is a perspective view of a shoulder tread for a tire showing my new design, it being understood that the pattern repeats uniformly throughout the circumference of the tread;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevation view thereof; the opposite side elevational view being identical thereto; and,
FIG. 4 is an enlarged front elevational view thereof.
In FIGS. 1–4, the broken lines defining the sidewall, inner bead and the peripheral boundary between the claimed tire tread and the sidewall depict environmental subject matter that forms no part of the claimed design.