Schlumpf Speed Drive, High Speed Drive, Mountain Drive
The Schlumpf Speed-drive works like two chainrings with a large difference in size.
With the additional transmisson ratio of 1:1.65 the gear ratio of the Rohloff SPEEDHUB 500/14, when used in conjunction with the Schlumpf Speed-drive, will be increased to 868%.
When fitting a Schlumpf transmission, please bear in mind that it is still important not to undercut the smallest permitted sprocket ratios (see 'sprocket ratios').
The Schlumpf Mountain Drive is not permitted for use in conjunction with the Rohloff SPEEDHUB 500/14.
The Schlumpf High Speed Drive (1:2.5) is not permitted for use with the Rohloff SPEEDHUB 500/14 due to its standard 27 tooth integreated chainring. A number of alternative chainring sizes are however available from schlumpf so as to not undercut our smallest permitted sprocket ratios.
For versions with compatible chainrings please contact schlumpf directly.