FIG. 1 is a top, front, and right side perspective view of an attachment receiver for a convertible bicycle showing my new design;
FIG. 2 is a right side elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is an enlarged partial top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged partial bottom plan view thereof;
FIG. 9 is an enlarged partial bottom perspective view thereof;
FIG. 10 is an enlarged partial bottom perspective view thereof with an exemplary footrest attachment; and,
FIG. 11 is an enlarged partial bottom perspective view thereof with an exemplary crankset and pedal assembly attachments.
The broken line showing of the convertible bicycle, footrest, crankset, and pedal assembly attachments are provided for the purpose of illustrating environmental structures and forms no part of the claimed design.