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I think the measurements on the Brompton website are for "pootling around town" type rides. I just got back from riding mine to Paris, and so was trying to get a set-up as close to my fitted road bike position as possible. I'm 5'11" and was just about able to get an extended 600mm seatpost high enough to be comfortable over long distances. If I was any taller I'd definitely have wanted a telescopic seatpost
Brompton say up to 6’8”…