FIELD: transport engineering; bicycles. SUBSTANCE: device has transmission section at one side of rear wheel hub axle, two direction pedal rotation device section at other side of hub axle, and clutch between transmission and pedal rotation sections providing transmission of power in one direction irrespective of direction of applied power. Device changes the speed according to conditions f riding. Moreover, transmission section control lever is introduced into left-hand part of axle of hub provided with holes at both sides. Rod lever to control section of device providing rotation of pedals in two directions is introduced into right part of axle of hub. Power converter can be mounted on standard bicycle compatible with such device. EFFECT: provision of optimum effectiveness of riding and uniform development of leg muscles in riding. 12 cl, 13 dwg
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