Ok Schwinnsta, more than anyone could want...
First a Mercier Nano , $300 from BikesDirect. The heaviest of the three, but with the biggest gear range. Somewhat modded from stock, with saddle, seatpost, stem, bars, SPDs and cranks all replaced. A mini-velo, not a folder.
Second a Xootr Swift.... the hinge is in the maintube and it's held together with the seat post. New bars, shifter, saddle, Ergon grips and my original Brompton 54 tooth crankset. Very rigid , and the stem comes off. I've replaced the stem and seat post QRs with Allen bolts since I've never folded it. Same wheelbase as most hybrids and the fastest small wheel I have.
My Brompton....
In this incarnation it has the Bikegang 3 sprocket hub, 11, 14 and 17 tooth, a flat bar and Ergons with bar ends. Leather saddle, 58 and 38 tooth chainrings on a Shimano 118 BB and a Sugino 110BCD crankset. Home made fugly mounting plate for the front bag and an old mtn bike friction shifter. Replaced the Brompton brake levers with some Tektro knockoffs. Also has 2 way SPDs.
You may have noticed a QR instead of a stem bolt, the sticker indicating we still hang bike thieves in Wyoming, and a little Allen bolt in the frame over the rear triangle bushing which allows for an oil dribble now and again. Does it increase bushing longevity? Who knows, doubt I've done more than 20 k miles since installed. I replaced the little wheels for rolling the folded bike with skinny non rollers since the bigger ones caught my feet and pants leg. I also have extra wheels including 177% 3 speed and some extra fronts. The Brompton is easily the lightest despite being made from Hiten steel and is also my all around favorite unless we are talking snow and ice at which point its my Surly Steamroller or my Cannondale M400, both equipped with studded tires in the winter months. I would be surprised if there is another Brompton in Wyoming and I've enjoyed playing with it almost as much as riding it.