Abstract: A suspension system for the drive wheel or wheels of a human powered vehicle provides a direct and rigid connection between the mounting of a driving pulley and the mounting of a driven pulley for rotating the drive wheel or wheels. A single and simple pivot junction allows the swing necessary for suspension of a rigid rear triangle carrying both of these mountings. A pressurized gas bag or a spring system is used to provide a biasing force between the rear triangle and a front triangle. This allows the maximum efficient use of human effort and avoids compromising the ideal operator position on the vehicle, as well as providing adjustable shock absorbing capabilities.

Abstract: A generally hollow bicycle frame of resin impregnated fibrous material having a main tubular portion and a cross tubular portion arranged in an X-shaped geometry as viewed from one side. A rear segment of the main portion may be slit to provide opposing rear stays for receiving a rear wheel assembly therebetween. The main tubular portion connects the head tube and the rear wheel supports and the cross tubular portion connects the bottom bracket and the seat sleeve. Both of these portions may be substantially straight and continuous from end to end and joined by a generally hollow common junction. Alternatively, the common junction may integrally unite a plurality of pre-formed tubular portions corresponding respectively to the supports for the front wheel assembly, the rear wheel assembly, the bottom bracket and the seat. The tubular portions may have round or non-circular aerodynamic cross-sectional shapes.