This is a A-60X17 Sprocket PN: 60X17Main Description As Following : A-60X17 Sprocket P.N: 60X17 Hub Required: XInside Diameter: 2"Outside Diameter: 4.463"Teeth: 17 Crossed From: WSS106017 , , 20006017 , , 20006017 , , 2827-41527 JOHN DAY , 3016-0233 , , 6713-53913 JOHN DAY , 673-S80601700 , , 673S80601700 , 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: 4.463" Teeth: 17