Bicycle for altering seat position to improve and optimize driving system has handlebars, a pedal crank drive, a height-adjustable seat and a frame structure for fastening front and rear wheels

摘要

Linked to a gearing unit (12) fitted in a drive wheel axle i.e. a pedal crank drive (14), a seat (5) adjusts for height by using an articulated joint in frame parts (4) and/or wheel parts and by altering an angle between the frame parts and/or wheel parts so as to fasten the front wheel (2) and rear wheel (3).