The ornamental design for a bicyclebasketholder, as shown and described.
FIG. 1 is an front perspective view of a bicycle basket holder showing my design, with portions of a bicycle shown in broken lines and forming no part of the claimed design;
FIG. 2 is a rear perspective view of the bicycle basket holder of FIG. 1;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a right side elevational view thereof, the opposite side view of which is a mirror image thereof;
FIG. 6 is a left side elevational view thereof, the opposite side view of which is a mirror image thereof;