Freehub DT Swiss EXP SRAM XD 12mm DS CapFreehub DT Swiss EXP SRAM XD 12mm DS Cap Replacement Upgrade Freehub body for DT Swiss Ratchet EXP hubs. Simple maintenance The no tool concept allows the tool free disassembly. Featuring an incorporated notch, the newly developed shape of the endcaps simplifies disassembly significantly and therefore makes the maintenance even easier. Freehub Body Conversion The no tool concept allows the conversion to a different drive train standard within seconds.