Originally Posted by
bloodfont
I understand your sarcasm

but you need a springloaded chain tensioner to use and FD and that is not possible on a fixed gear, it'll rip it of.
Initialy I thought you gave me a link to the Schlumpf 2 speed crankset, which is an option, but expensive
I know the flip-flop hub is an option, but it's a bother in group rides with people with derailleurs. Also it wears out the drouputs (especialy since it's a conversion to fixed, not a track-specific frame).
I am interested though, in what you said regarding the QR, do you use a QR on a fixed gear rear hub? How's it holding out? Have you had any issues?
As indicated above it has worked great and been bullet proof. Its a single speed (with flip flop hub) which was successfully used since 1890-ish. It has been ridden around the world by more than a few people.