
A U-type bicycle handbrake assembly structure is provided so that the brake arms could be quickly and easily positioned. The invention cuts a planar surface on the fitting tube welded to the bicycle frame. The planar surface is parallel to the brake pad's contact surface to the wheel rim. The invention then configures a protruding plate on the adjusting seat along the adjusting seat's axial direction. When a brake arm is pin-joined to the fitting tube of the bicycle frame, the brake arm could be...











