Zipp Freehub Kit - Cognition Disc / Rim Brake NSW XDR Generation 2. Freehub bodies for Zipp Cognition hubs. TECH SPECSCassette Body Type SRAM XDRCassette Body Type SRAM XD 11/12 SpeedMaterial Aluminum

Freehub bodies for Zipp Cognition hubs.1.8 mm spacer is included for use with XD cassettesFor 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 systemEnd c