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You can ditch the 3-speed hub, and keep it a 3 speed by fitting 3 x sprockets from a 10 speed cassette, in place of the standard 2 speed ones.
Narrower sprockets y'see.
The standard 2 speed shifter can be modified to have a third position to click to.
Or you can fit a friction shifter.
You also need a 10 speed chain.
I've had the kit for this conversion sitting on my workbench for months.
Just haven't got around to fitting it.
JurekB
neu
It also has no pedals! But the more I carry mine around the more I want to shave a kilo off it. So wonder what part of it could be designed lighter, the 3 speed hub seems a good candidate to trim some weight from. Brompton have a decent enough customer base to warrant getting more of their bits custom made, what about higher spec lightweight steel? Seems to be making a come back in road bikes. My roadie is also aluminium (CAAD) and the most comfy bike I've owned, I appreciate that is as much to do with geom and carbon forks but it feels like Brompton are missing a market opportunity. The Austin ATTO is a nice idea with a terrible fold but shows what can be done.