
Brompton as one of the best folding bike design has always suffered the lack of proper gear range for hilly terrains. BIKEgang has kept searching for the best gearing solution for quite some time. Mountain Drive is always our top choice to widen the gear range.
Mountain drive is a gearing system that makes the chainring spinning at a much lower rate (2.5:1). For instance, 56T chainring with mountain-drive engaged, will work like a much smaller one (23 tooth chainring equivalent).
This Brompton version comes with a torque arm to prevent BB shell preparation. So no BB shell preparation required.
Specification
(Chain driven version / Model SD040)
- Cone ring configuration, incl. gears, crankarms, kickplates, 56T or less Chainring and chain guard (or 60T chainring without cover) - BCD110 spec.
- With two gears: Direct drive 1:1, Underdrive 2.5:1
(1:0.4 = 60t: 24t gear ratio. That is if you install 60t physical chainring. Heel kick will gear shift to 24t when engaged.)
- BB and Axle included for Brompton spec. Contact us for other bike or ebike custom model.
Weight:About 1700 g.
Please compare the total weight of mountain-drive to the total weight of a triple
chainring set including shifter, cable, derailleur. Example: Shimano Altus
(48/38/28 teeth): weight incl. right crankarm: 1255g
Features
About ATS
|
|
|