This is a A-50V11 Sprocket PN: 50V11Main Description As Following : A-50V11 Sprocket P.N: 50V11 Hub Required: VInside Diameter: 1 1/8"Outside Diameter: 2.504"Teeth: 11 Crossed From: WSS105011 , , 20005011 , , 20005011 , , 2827-39127 JOHN DAY , 3016-0182 , , 6713-51413 JOHN DAY , 673-S80501100 , , 673S80501100 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Sprockets, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Hub Required: V Inside Diameter: 1 1/8" Outside Diameter: 2.504" Teeth: 11