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@JurekB
This'll make you laugh.
It had me in fits.
I've just finished chasing and facing the BB shell on mine, in anticipation of fitting it with a Shimano Alfine with a 52T ring, and sexy Taiwanese CNC'd guard.
Anyone thinking of doing this for weight weenie reasons might want to reconsider....
The original Brompton kit, with a FAG BB, at 54T - 916g.
The Shimano kit tips my kitchen scales at 1100g.
Prettier, but at a price / cost.
I'll see how I get on with it. I'm not binning the Brompton chainset / BB just yet.
I daresay the DA / Ultegra BBs are lighter with their ally (as opposed to steel) spindle.
I'd be interested to know - if anyone has had theirs on the scales.
Meh!