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Cycle Monkey

Internal Gearing Specialists, Bicycle Distribution & Service Center

Schlumpf Speed Drive


  • 1.65 overdrive ratio (similar to a front derailleur shift)
  • Small physical chainring and larger effective chainring size in overdrive mode
  • Close range well suited for use with single speeds, fixed gears, internal gear hubs, and rear derailleurs
  • Splined chainrings available in 27-40T
  • 110mm BCD spider also available for standard chainrings
  • 110mm BCD spider version can be used with two chainrings
  • Optional trouser guard available
  • Offers 868% gear range when combined with Rohloff SPEEDHUB 500/14
Schlumpf Speed Drive (SD Splined, 60-72mm, Aluminum)

The Schlumpf Speed Drive is ideal for town bikes: single speeds, fixed gears, internal gear hub bikes, or bikes with only a single, rear, derailleur. The close 1.65 overdrive ratio means shifts can be made more often and more comfortably. This is also the best Schlumpf model to combine with a Rohloff SPEEDHUB 500/14 for those applications in which the gear range of the SPEEDHUB 500/14 is not enough. It's also great for small-wheeled bikes to get a larger gear ratio without a huge physical chainring.



Crank arms and sprockets sold separately Contact us for availability and other configurations.