This is a A-RBW1316 W Hub PN: RBW1316Main Description As Following : A-RBW1316 W Hub P.N: RBW1316 Dim A (1): 1-5/8"Dim B (2): 1-13/16"Dim C (3): 7/16"Dim D (4): 1"Bore: 13/16 roundKeyway: 3/16" X 3-3/32" Crossed From: WSH20013 , , 20020013 , , 20020013 , , 3016-0112 , , 6713-57563 JOHN DAY , 673-S80020800 , , 673S80020800 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Hubs, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 1-5/8" Dim B (2): 1-13/16" Dim C (3): 7/16" Dim D (4): 1" Bore: 13/16 round Keyway: 3/16" X 3-3/32"