This is a A-40X38 Sprocket PN: 40X38Main Description As Following : A-40X38 Sprocket P.N: 40X38 Hub Required: XInside Diameter: 2"Outside Diameter: 6.334"Teeth: 38 Crossed From: 20004038 , , 20004038 , , 3016-0165 , 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: 6.334" Teeth: 38