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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
@dominijk
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.