Abstract: A bicycle rear article carrier that converts into a single-wheeled trailer is disclosed. The carrier is nearly indistinguishable in appearance and utility from conventional rear carriers, however, its folding and/or telescoping mechanisms incease bicycle cargo carrying capacity by a significant factor. A 12 inch quick-release wheel that is integral to the trailer unit can be stowed on the side of the rack without undue diminishment to carrier utility. If defined strictly as a trailer, the unit ‘disappears’ and becomes fully integrated with the bicycle by a few quick moves, comprising a system of ergonomic efficiency, space economy and convenience.