Abstract: Bicycle Attachment Device with a rigid shaft approximately six inches long and having a diameter that is sized to slidably fit into a standard bicycle seat support tube, the shaft fixedly attached in a perpendicular fashion toward on end of a square cross section rigid tube or bar sized to fit into the inner dimension of a standard square cross section trailer hitch tube, and the square tube having a standard bolt retaining aperture to help secure attachment to a standard matching aperture in the trailer hitch. A preferred embodiment includes the rigid shaft may include a plurality of progressively larger stepped diameters to accommodate the various inside diameters found on common bicycle seat support tubes, the stepped diameters.