high speed drive

The Schlumpf high speed drive has a large gear transmission ratio and is suited to riding in very high gears. A small sprocket (e.g. 27 teeth) shows great impact in a big gear with 67 teeth. High speed drive is ideal for many applications; especially folding bikes (Brompton, Birdy, etc.) profit from it being modest, wireless, low-maintenance and simply ingenious.



Installation of schlumpf High Speed Drive

High speed drive

Development: 250%

Gears: 1:1 and 1:1.25 gear ratio

Bottom bracket: BSA: 68-72mm width; broader axes on premise

Chain wheel acceptance:

Integrated chain wheel with 27, 30 and 34 teeth and integrated trouser protection disk

Crank acceptance: Square JIS (Japanese Industrial Standard)

Colour: Black

Torsional acceptance:

Cone rings with 45 degree angle and equivalent locknuts:

- Aluminium rings (for steel framework)

- Steel rings (for aluminium framework)


The Gear drive/ box will be delivered fully assembled with the chain wheel and crank of your choice.


High speed drive Chain wheel – Aluminium


Acceptance: 5-hole, BCD 130mm

Teeth number: 38T, 40T, 42T, 44T, 46T, 48T until 75 teeth

Material: Aluminium 7075

Colour: silver