The ornamental design for a side mirror for motorcycles, as shown and described.
FIG. 1 is a front view of a side mirror for a motorcycle according to our new design (the left side mirror for motorcycles being a mirror image thereof),
FIG. 2 is a top plan view thereof,
FIG. 3 is a right side view thereof,
FIG. 4 is a cross sectional view thereof taken along line 4—4 in FIG. 1; and,
FIG. 5 is a front view showing the side mirror installed on a motorcycle.
In the drawings, the broken lines depicting a motorcycle form no part of the claimed design.