YBR125 motorcycle chain adjustor, hole distance 67mm, inner hole 7.5mm size and YBR125 back flat fork installation position exactly match, 2 sets of strict standard original factory configuration, direct replacement without adjusting the installation hole; The main body is made of galvanized steel, rust and corrosion resistant, suitable for the complex conditions of outdoor motorcycle riding; With adjusting screw + nut, can accurately control the tightness of the chain, easy operation without additional tools (wrench); After alignment, the flat fork installation hole can be assembled, adjust the stroke to cover the normal wear range of the chain, and adapt to the long-term use demand; Precise adjustment precision can ensure uniform chain tension, reduce chain tooth jump, abnormal noise and sket wear, prolong the life of transmission components.