The ornamental design for an automobiletire tread, as shown and described.
FIG. 1 is a front view;
FIG. 2 is a rear view;
FIG. 3 is a left-side view;
FIG. 4 is a right-side view;
FIG. 5 is a perspective view; and,
FIG. 6 is an enlargement of a portion of the front view.
The broken line depictions of sidewalls and beads are illustrative of environmental structure and the sidewalls extending radially inward from the solid line borders of a tread area of the tire to the innermost broken line depiction of the beads form no part of the claimed design.