... : 18.80mmDescription of scooter chain sprocket:1. scooter chain sprocket with competitive price 2.durable and high quality 3.stable performance ... coil,startor motor,shock absorber,pole shift,pedal break,meter,muffler,crand case,hub comp,oil pump,rear swining,chain sets,cylinder ... ,brake shoe,piston set,lamp,cam,engine,clutch assembly,head ...