Brompton Drive Schlumpf Compatible 40T/56T Chainring w Cover BCD130 (H&H)
high speed drive - schlumpfdrive - ultraflat Planetary Gear for Bikes
Freedom Folding Bikes - LOOK - A 12-Speed Brompton! I just completed an ATS/ Schlumpf drive conversion on Suretta's Brompton. This is a 2-speed bottom bracket that is shifted from low to high
Question on experience with Schlumpf & bikegang : r/Brompton
Titanium Brompton with Disc Brakes and Schlumpf Drive - YouTube
Brompton Drive Schlumpf Compatible 40T/56T Chainring w Cover BCD130 (H&H)
E.3.5.1. high-speed-drive for Brompton folding bike - schlumpfdrive - ultraflat Planetary Gear for Bikes