Heavy duty / E-Bike version of the DT Swiss 350 hub Increased hub shell/flange thickness and larger bearings for extra durability With DT's ratchet system (24t), all of the teeth on each side of the ratchets engage simultaneously every time. This creates much smaller point loads and results in the legendary reliability of Ratchet System hub International Standard 6bolt disc mount Rear hubs have steel FH body and 24t ratchet HG 811sp: Not compatible with HG 11sp road cassettes DT Swiss spoke calculator: https://spokescalculator.dtswiss.com/en/calculator