The ornamental design for a storagerack for a bicycle, as shown and described.
FIG. 1 is a perspective view of a storage rack for a bicycle;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view thereof; and,
FIG. 8 is another perspective view thereof, showing the side racks of the storage rack for a bicycle removed.
The short dash-short dash lines depict portions of the device that form no part of the claim. The long dash-short dash lines indicate a surface boundary of the device.