The ornamental design for a spikepin for automobiletire, as shown and described.
FIG. 1 is a perspective view of a spike pin for an automobile tire showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a cross sectional view taken along lines 6-6 shown in FIG. 2; and,
FIG. 7 is a cross sectional view taken along lines 7-7 shown in FIG. 3.
A rear view appears to be identical to the front view and is omitted. A left side view appears to be identical to the right side view and is omitted. The broken line showing portions of a spike pin depicts environment and forms no part of the claim.