Join Date: Sep 2007
Location: Base of the Rocky Mountains, Canada. Wonderous things!
Bikes: 2010 Cannondale Hooligan 3
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The aforementioned options (traveller's check, tournado, ritchey breakaway, slingshot) are all travel bikes, not multi-modal commuter bikes. They require disassembly to fold, and are designed for travel rather than fitting on a train every morning.
Big wheeled folders don't get very small, at all. Do you have local regulations determining the size of a folded bicycle?
As for model recommendations, I can't make any in the 700c wheelsize, as i'm not aware of any bicycles with that particular spec that are designed as folders rather than just travel bikes. There is one that comes to mind, the Montague Boston singlespeed, but it isn't available as of yet. I don't personally recommend the Montague bikes for multi-modal use either, they're bulky and require the removal of the front wheel - but then again, most big wheeled folders will require some measure of disassembly.
In other wheelsizes, there are some choices. There's the Dahon Cadenza, which is available with bullhorn road bars as a single speed or 8 speed IGH for instance.
The most choice, and in my opinion, the best choice, by far, are the bikes with smaller wheels. Bike Friday can make a road bike any way you want, high end, high performance. Other companies like Dahon offer small wheeled road bikes as well. If you can get over your concerns about the smaller wheels (they really aren't a problem unless you're extreme off roading or slamming into curbs carelessly), then you'll get great choices with both high performance riding and compact folding.