This is a A-60X45 Sprocket PN: 60X45Main Description As Following : A-60X45 Sprocket P.N: 60X45 Hub Required: XInside Diameter: 2"Outside Diameter: 11.176"Teeth: 45 Crossed From: WSS106045 , , 3016-0261 , , 6713-55063 JOHN DAY Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Sprockets, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Hub Required: X Inside Diameter: 2" Outside Diameter: 11.176" Teeth: 45