Onyx Vesper MTB DH Disc Hub

Unlike traditional hubs that use pawls or ratchets to engage, the Onyx Vesper uses a sprag clutch mechanism. This allows for instantaneous engagement with zero drag, meaning power transfer is immediate the moment you start pedaling, and the hub remains completely silent while coasting.

This hub is designed for specific standards: it uses a 157mm spacing, a 12mm thru-axle, and a 6-bolt rotor mount. Please verify your frame's rear spacing and axle requirements before purchasing, as it will not fit standard Boost (148mm) or non-boost frames.

No, this specific model comes with a SRAM XD-R freehub body. If you are running a Shimano drivetrain, you would need to source a compatible freehub body separately or ensure your cassette is compatible with the XD-R standard.

While the Vesper is engineered primarily for cross-country and trail riding, its robust construction handles technical terrain exceptionally well. However, if you are strictly riding heavy-duty downhill or enduro, you may want to compare it against Onyx's dedicated gravity-focused hubs to ensure it meets your specific durability needs.

The sprag clutch is highly reliable, but like any high-performance hub, it benefits from periodic service to keep the internals clean and lubricated. Onyx recommends using their specific proprietary fluid to maintain the clutch's performance and silent operation over time.