Zipp ZM2SL/ZR1 Freehub Body Kit Description: The Zipp ZM2SL/ZR1 Freehub Body Kit works to adapt Zipp ZR1 and ZM2 SL hubs as well as the Zipp 1ZERO HITOP SW rear wheel for use with Shimano Micro Spline 12 speed cassettes. Features: Shimano Micro Spline compatible freehub body replacement for Zipp ZR1 and ZM2 SL rear hubs and the Zipp 1ZERO HITOP SW rear wheel 6 pawl design provides 66 points of engagement for near instantanious forward propulsion Aluminum alloy freehub body construction combines low weight and great durability Compatible with 12mm x 142mm and 12 x 148mm thru axle rear hubs Specifications: Compatibility: Zipp ZR1 hubs | Zipp ZM2 SL hubs | Zipp ZR1 1ZERO HITOP SW Rear Wheels Freehub Body: Shimano Micro Spline (12 Speed)