This is a A-60X23 Sprocket PN: 60X23Main Description As Following : A-60X23 Sprocket P.N: 60X23 Hub Required: XInside Diameter: 2"Outside Diameter: 5.906"Teeth: 23 Crossed From: WSS106023 , , 20006023 , , 20006023 , , 2827-42127 JOHN DAY , 3016-0239 , , 6713-54213 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: 5.906" Teeth: 23