One of the questions we get frequently asked is ... how can I further reduce the gearing on my Brompton

The Brompton A Line B75 comes with a 44T chainring (and Brompton don't make a smaller one)

The Brompton C Line Explore (6 speed) comes as standard with a 50T chainring and an Urban (2 speed) comes as standard with 54T

This change can only be made to the "spider" crankset - not the older fixed crankset

To see the effects of changing Brompton gearing - check out the Brompton Gear Calculator

http://xldev.co.uk/bgc.html

The video consists of several parts
0:00 | Intro
2:15 | Removing your old chainring
4:33 | Installing the new chainring
5:47 | Shortening the chain
8:04 | Test ride
8:46 | Outtakes

The 39T SRAM chainring we used was:
https://brilliantbikes.co.uk/chainrin...

Chain ring tool:
https://brilliantbikes.co.uk/bike-too...