FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a fragmentary enlarged front view showing the details of the tread portion thereof; and,
FIG. 8 is a section view taken along line 8-8 in FIG. 7.
In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design.