Freehub kit for Zipp Cognition NSW disc rear hubs. Available for Shimano 8/9/10/11- Sram 8/9/10-speed, Campagnolo 9/10/11/12-speed, and SRAM XDR 11/12-speed.
For Gen 1 Cognition hubs (manufactured prior to the 21st week of 2018)
Gen 1 hubs feature a two-piece axle system
Cassette Body Type: SRAM XD 11/12 Speed , SRAM XDR