Originally Posted by
cnnrmccloskey
its a keyed locknut
not familiar with that hub so I don't know if thats a fair price or if its specificaly for that hub, someone who is familiar with it could help more.
No. It's just a locknut. With what looks like deeper serrations so that a track hub will not slip on bad dropouts. The zipp website almost shows it to be some sort of proprietary cone/locknut combo - not quite sure
http://www.zipp.com/support/maintena...-axle-kits.php
The OP should be able to verify this easily.