12T 13T 14T 15T 16T 17T 18T Cog Sprocket Hardened Steel Fixed Gear Fixie Gigi Mati

12T 13T 14T 16T Cog Sprocket Hardened Steel Fixed Gear Fixie Gigi Mati threaded fixed gear. 12T no lock 13T no lock 14T no lock 13T with lock ring 16T with lock ring FREEWHEEL-34.8MM LOCK RING-32MM