This is the 14 tooth sprocket for the flywheel axle.
NEW! Concept2 Rear Leg - Model E Rowing Machines
NEW! Concept2 Saddle — BikeErg
NEW! Concept2 Frame Lock and Hardware — Model C and D Indoor Rowing Machines
NEW! Concept2 Track/Tape Assembly with Rivets — RowErg, Model C, D and E Rowers
NEW! Concept2 Nickel Chain w/ Connector Swivel — RowErg, Model C, D and E Rowers
NEW! Concept2 Front Leg Assembly - Model E Rowing Machines