FIELD: biotransport vehicles. SUBSTANCE: bicycle has frame 1, handlebar 2, wheels 3 and 4, brake system and adjustable length drive; bottom bracket unit and pillar 7 are installed in seat tube 6 for travel in relatively opposite directions by means of control device 8 installed on frame horizontal tube and connected with control cable. Each crank has extension in body with fixing rod and stop on one end and with pedal on other end. EFFECT: enhanced operating characteristics owing to improved reliability of drive and provision of elongation of cranks. 4 cl, 7 dwg
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