| 摘要 |
PURPOSE: A bicycle is provided to improve riding comfort using the elasticity of a leaf spring and to make passengers feel comfortably by controlling the height of a crank shaft case. CONSTITUTION: All the parts of a bicycle except a head tube, part of a seat tube, and a steerer and a crown of a fork are made by a leaf spring. The bicycle does not have a down tube and a chain stay. The height of the seat tube and the crank shaft case is controlled. [Reference numerals] (AA) Saddle; (BB) Crank shaft; (CC) Crank shaft case; (DD) Handle
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