This is a A-40X60 Sprocket PN: 40X60Main Description As Following : A-40X60 Sprocket P.N: 40X60 Hub Required: XInside Diameter: 2"Outside Diameter: 9.841"Teeth: 60 Crossed From: WSS104060 , , 20004060 , , 20004060 , , 3016-0178 , , 6713-51163 JOHN DAY , 971-20004060 , , 97120004060 , 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: 9.841" Teeth: 60