This is a A-50X36 Sprocket PN: 50X36Main Description As Following : A-50X36 Sprocket P.N: 50X36 Hub Required: XInside Diameter: 2"Outside Diameter: 7.519"Teeth: 36 Crossed From: WSS105036 , , 20005036 , , 20005036 , , 3016-0207 , , 6713-52663 JOHN DAY , 673-S80503600 , , 673S80503600 , 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: 7.519" Teeth: 36