... 51mm 3. pin diameter: 18.80mmDescription of scooter chain sprocket:1. scooter chain sprocket with competitive price 2.durable and high quality 3 ... meter,muffler,crand case,hub comp,oil pump,rear swining,chain sets,cylinder,brake shoe,piston set,lamp,cam,engine, ... clutch assembly,head cylinder cover,ignition coil,chain box,cable,etcOur exporting products sprcialized in the Modle of CG125 ...