Creation of a bearing point for the buttocks and for the human trunk by means of a back rest fixed to the frame of the bicycle or forming an integral part of the saddle in order to improve the direction and power of the effort provided by the legs

摘要

The invention consists of the creation of a bearing point for the buttocks and for the human trunk by means of a back rest fixed to the frame of the bicycle or forming an integral part of the saddle in order to improve the direction and power of the effort provided by the legs.