ONYX FREEHUB XDR - ALLOY

Since 2020 Onyx has supplied all their Classic and Vesper hubs with MFU assembly. The three-letter acronym stands for modular freehub unit. It’s a brilliant piece of engineering that means freehubs are interchangeable across Onyx's whole product lineup. For inststance, the same Freehub can be used on a MTB hub set with Boost spacing 110x15/148x12 as on a Road hub set with 100x12/142x12 spacing.