Originally Posted by
chagzuki
You'll have to research the geometry to find the best solution (there's a diagram somewhere on the net with precise cockpit measurements for brompton types) but I seem to remember littlepixel's bike started off with S stem and drop bar, before he switched to the moustache and the geometry looked good.
The only reason I would fork out for another brompton stem is if it allows the Dahon clamp to work better. It fouls on the stem bolt unless quite vertical. ( see picture 2)