Freehub bodies wear out, get damaged, or simply need to match a new cassette standard. The Zipp Cognition Freehub Body serves as the direct replacement for Cognition hubs, available in three driver configurations to cover the major cassette systems on the market. Whether you're converting an existing wheelset to a different drivetrain or replacing a worn driver, this is the part that interfaces between your cassette and the hub shell.

The SRAM/Shimano 11-speed version uses the standard HG spline pattern that's been the dominant road cassette interface for years. If you're running a Shimano 11-speed cassette or any SRAM cassette up through 11-speed, this is the driver you need. The Shimano Microspline option opens up compatibility with Shimano's 12-speed road and mountain cassettes, which use a different spline pattern than the older HG standard. For Campagnolo users, the N3W freehub body accepts current Campagnolo cassettes—that's the newer Campagnolo standard that replaced the older UD spline pattern.

Installation is straightforward if you've worked on hub internals before. The freehub body slides onto the hub axle and secures with the end cap system. You'll want to verify your hub uses the Cognition internals rather than the ZR1 system, as the freehub bodies aren't interchangeable between hub generations. Zipp's documentation lists compatible wheel models, but the short version: if your wheels came with a Cognition hub, these are the replacement drivers.... Read More