Freehub bodies for Zipp Cognition hubs.
- 1.8 mm spacer is included for use with XD cassettes
- For Gen 2 Cognition hubs manufactured after the 21st week of 2018 (serial number would be 21P8 or higher, such as 51P8)
- Gen 2 hubs feature a one-piece axle system
- End caps sold separately
