The ornamental design for a bicyclehandlebar, as shown and described.
FIG. 1 is a top perspective view of a bicycle handle bar showing my new
design, it being understood that the broken lines are for illustrative
purposes only and form no part of the claimed design;
FIG. 2 is a top view of the bicycle handlebar, it being understood that the
bottom view is a mirror image thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a front view thereof; and,
FIG. 5 is a left side view thereof, it being understood that the right side
view is a mirror image thereof.