The Brompton B75 is fitted with 3 gears. The bike is fitted with the ultra-reliable Sturmey Archer internal geared hub. Famous for its long service life and its durability, this hub is controlled by a simple trigger shifter mounted on the right side of the handlebar.
To make the bike easier to ride when pedalling up hills or under load, the front chainring has also been reduced in size. This provides a 12% reduction over the standard Brompton and makes the bike much more capable over a wider range of terrain.
For full information on the gear ratios, please follow this link:
For more information on the Brompton B75, please visit the following webpage:
To build a custom Brompton, please visit the following webpage: