SCHLUMPF MOUNTAIN-DRIVE / SPEED-DRIVE 2-speed internal chain-set gearbox

Sale price Price £720.00 Regular price Unit price  per 


the super-flat planetary gearbox (only 10mm wide), blends in alongside the chainring in a seamless fashion

change gear  with a simple kick of the heel on the side buttons, while standing still or under heavy load

low maintenance

no cables, levers or derailleurs

high efficiency, high quality materials, ensure great longevity

symmetrical clutch allows full torque in both pedalling directions, making it compatible with coaster brakes and fixed-gear bikes without a rear brake

the optional EASY-SHIFT plates, available on request, cover the whole crank arms and allow for shifting by pushing on a larger area, best for clip-in pedals

SPEED-DRIVE ratios: direct-drive : 165%

MOUNTAIN-DRIVE ratios: 40% : direct-drive (for even the steepest climbs)


videos on our ‘TECHNOLOGIES’ page


*SPEED-DRIVE requires chamfering of the bottom bracket shell with the tool offered in this same listing