Seat adjustment device for bicycle

摘要

The device has two plates (22) which are arranged parallel to one another, and each of them has a first hole (222) and a first long hole (224), which is arranged under the first hole. The upper part has a second hole (24) and two first elongated semi-circular cross-sectioned cavities (202), which are arranged in an upper surface of the upper part (201). An installation component (26) has a tapped hole (28) and two second elongated cavities (261) semi-circular in cross-section are provided in a lower surface of the installation component, parallel to one another and spaced apart. A seat bar (10) has first and second ends, with the first end having a face-side rounded upper part (14).