Gilmour lugged steel, Bianchi Volpe, Bike Friday Pocket Rocket
I'd love to know the answer, too. I love my dahon, but I cannot get up out of the saddle and hammer like I can on my Bike Friday. I wonder if you can order a stem assembly by itself from Bike Friday? they both use 1" headsets so it might work. the downside would be that the fold on the dahon would then become much more cumbersome.