This is a A-60X40 Sprocket PN: 60X40Main Description As Following : A-60X40 Sprocket P.N: 60X40 Hub Required: XInside Diameter: 2"Outside Diameter: 9.98"Teeth: 40 Crossed From: WSS106040 , , 3016-0256 , , 6713-54963 JOHN DAY , 673-S80604000 , , 673S80604000 , 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: 9.98" Teeth: 40