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  2. Rohloff Speedhub - Wikipedia

    en.wikipedia.org/wiki/Rohloff_Speedhub

    Rohloff hubs generally require a break-in period to function optimally. The manufacturer suggests this may require 500–1,000 miles (805–1,610 km) of active riding. For some riders the break-in period may be longer. Until the hub is broken in the rider may experience some noise or vibrations when the reduction-gear is in operation (gears 1–7).