This is a A-60X28 Sprocket PN: 60X28Main Description As Following : A-60X28 Sprocket P.N: 60X28 Hub Required: XInside Diameter: 2"Outside Diameter: 7.106"Teeth: 28 Crossed From: WSS106028 , , 20006028 , , 20006028 , , 3016-0244 , , 6713-54463 JOHN DAY , 673-S80602800 , , 673S80602800 , 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: 7.106" Teeth: 28