... available A3 steel(1023), 45#steel(1045), 16Mn Motorcycle Rear Sprocket Motorcycle rear sprocket, motor sprocket, sprocket wheel, motorcycle sprocket wheel, ... inner sprocket, set sprocket,motor gear, motor front gear, motor rear gear, motorcycle sprocket, motorcycle set sprocket, motor complete sprocket, ... option: 12T/13T/14T/15T/16T/17T, etc.2. Rear sprocket teeth option: 35T/36T/38T/39T/40T/41t/42T ...