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The handlebar,the pedals and the stay joint cylinder are rotatable parts that could reduce the width of the bike.Their structure details are displaced in the PDF document.The chains are replaced by gears directly assembled near the rear tire which could avoid chain rust.The front tire consists of rubber and two arc ball slides---one is fixed and the other is rotatable.As you ride,only the rubber and the outside slide will rotate.The prop stand is assembled at the center of the front tire to avoid complicating the rear tire structure.
Tianjin Chengjian University,Tianjin,China