I recently came across this article from a bloke from London (my adopted city!) about his search for a folder that he could fix up, fixie style. It’s is a topic close to my heart, being a fellow fixer on a folder.
Finding a fixable folder isn’t an easy task, there are all kinds of considerations to make, including the fact that many folder use non-standard parts. Andrew’s found a UK based road bike running 24 inch wheels that folds, folds, folds down into an airline check-in bag (given enough patience). The Airnimal Chameleon is a suspended, unified rear triangle design apparently suitable for winning a triathlon or two while still folding up quickly for your average bus trip. Andrew’s got his suited out with an ENO eccentric hub to handle chain tension. His epic journey across Dahon, Brompton, the Swift folder and others is educational to say the least. All things considered, I’m glad to hear even the higher end frames have an occasion creak and squeak, at least I’m not the only one.
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A good friend of mine rides a Bike Friday Pocket Rocket Pro which is fixed. The frame has track style dropouts. You can see some pics here:
http://www.fixedgeargallery.com/2007/dec/3/JesseRatzkin.htm