Crank Brothers Synthesis Freehub Body—Shimano HG/Synthesis Base Steel Driver

This freehub body is specifically engineered for Crankbrothers hubs, as well as Industry Nine Hydra and 1/1 hub systems. Before purchasing, verify that your current hub matches these specific models to ensure proper fitment and engagement.

No, the freehub body type is specific to the cassette standard you are using. This part is available in both Shimano HG and XD configurations, so you must select the version that matches your specific cassette interface.

Steel is significantly more durable and resistant to 'cassette bite,' where the cassette cogs dig into the splines of the freehub body. While slightly heavier than alloy, steel is the better choice for riders who prioritize longevity and want to prevent damage from high-torque pedaling.

This product is the freehub body shell. It typically does not include the bearings, seals, or pawls required for a full rebuild, so you should plan to reuse your existing internal components or source a separate service kit if those parts are worn.

If you are comfortable with basic drivetrain maintenance and have the correct tools to remove your cassette and end caps, this is a manageable DIY task. If you are unsure about hub disassembly or bearing preload, a professional mechanic can ensure everything is seated correctly to prevent play.