mountain drive

With the schlumpf mountain drive you gain additional very low gears which enable you go climb the most extreme inclines easily. The extremely flat planetary gearbox shrinks every gear by factor 2.5, that way doubling the expansion extent of your bike. Shifting while standing still or under heavy load at the mountain road is no problem here (as with all other Schlumpf gears as well); a simple kick on the shifting button with your heel and the fun can start. Mountain drive is also available as a Brompton version.

 

 

Mountain drive BCD 110/BCD 130

Development: 250%

Gears: 1:1 and 2.5:1 reduction gear ratio

Bottom bracket:

BSA: 68-72mm width (broader axes on premise)

Chain wheel acceptance:

- Chain wheel star with BCD 110mm

- Chain wheel star with BCD 130mm

Crank acceptance: square JIS (Japanese Industry Standard)

Colour: black

Torsional acceptance

cone rings with 45 degree angle and equivalent slotted nuts

- Aluminium rings (for steel framework)

- Steel rings (for aluminium framework)

Torsional support:

Option instead of the cone rings (no bottom bracket milling; will be fixed at the chain stay)

Delivery:

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

 

Mountain drive 27 teeth Chain wheel

Development: 250%

Gears: 1:1 and 2.5:1 reduction gear ratio

Bottom bracket:

BSA: 68-72mm width (broader axes on premise)

Chain wheel:

27chain wheel

Crank acceptance: Square JIS (Japanese Industry Standard)

Colour: black

Torsional acceptance:

cone rings with 45 degree angle and equivalent slotted nuts

- Aluminium rings (for steel framework)

- Steel rings (for aluminium framework)

Torsional support:

Option instead of the cone rings (no bottom bracket milling; will be fixed with torque arm at the chain stay)

Delivery:

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

 

Chain wheels BCD 110mm - Aluminium





Acceptance: 5 hole, BCD 110mm

Tooth number: 42T, 44T, 46T, 48T, 50T, 52T, 53T

Material: Aluminium 7075/T6

Colour: silver

 

Chain wheels BCD 110mm - Steel




Acceptance: 

5 hole, BCD 110mm

Tooth number:

34T, 36T, 38T, 40T

Material: Steel

Colour: black

 

Chain wheels BCD 130mm - Aluminium

 



Acceptance: 5 hole, BCD 130mm

Tooth number: 38T, 40T, 42T, 44T, 46T, 48T, 50T, 52T, 54T, 56T, 60T, 65T, 70T, 75T

Material: Aluminium 7075

Colour: silver

 

 

Spiders




Gear box: mountain drive

Types: BCD 110 or BCD 130

Material: Steel or aluminium

Colour: black

 

mountain drive - Cargo

Implementation: Cargo: chain wheel star bolted 8 times

Development: 250%

Gears: 1:1 and2.5:1reduction gear ratio

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

Chain wheel acceptance:

- Chain wheel star with BCD 110mm
- Chain wheel star with BCD 130mm

Crank acceptance: Square JIS (Japanese Industry Standard)

Colour: black/chrome

Torsional support:

Yes (no bottom bracket milling; will be fixed at the chain stay)

Delivery:

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