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@RichardC
I'm now actively exploring this idea and will be happy to share ideas and progress, but have one question at this stage: presumably a switch to a 9- or 10-speed chain is necessary? I ask because I accidentally tried to put a 9-speed chain on my B at an earlier point, and the Brompton shifter mechanism didn't like it. It sulked and refused to change sprockets. Anyone have any thoughts on this?
PS: My previous post on this shows up as from a guest, user89861. But I've now signed up to the site properly.