Abstract: A trailer assembly which is connectable to a bicycle, which bicycle has a seat mounted on a seat post, the trailer assembly comprising a frame having an upper portion and a lower portion with the upper portion being connected to the bicycle proximate the seat post, the connection permitting movement in both longitudinal and horizontal planes. The trailer includes an axle, a single wheel and a fork connected to the axle on either side of the wheel and baggage carrying means which include a frame and a connection between the frame and the fork, with the lower portion and the baggage carrying frame being connected together. The arrangement provides a trailer which may be suitable for many purposes including carrying baggage, child seats, and the like.