This is a A-40V12 Sprocket PN: 40V12Main Description As Following : A-40V12 Sprocket P.N: 40V12 Hub Required: VInside Diameter: 1 1/8"Outside Diameter: 2.166"Teeth: 12 Crossed From: WSS104012 , , 20004012 , , 20004012 , , 2827-37527 JOHN DAY , 3016-0140 , , 6713-49813 JOHN DAY , 673-S80401200 , , 673S80401200 , 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: 2.166" Teeth: 12