Originally Posted by dkb
The problem with QR's on fixed gear bikes is that the horizontal dropouts and (horizontal) track ends allow the axle to slide around more readily than a bike with vertical dropouts, which don't allow for much, if any, horizontal movement.
The sudden torque of the relatively high gearing on fixed gears tends to repeatedly yank at the axles in stop and go traffic. Use tugnuts or chain/axle positioners or whatever they're called to hold your axle in place with the QR's. I'm not a weight weenie so I don't mind carrying my tools and a kitchen sink around with me all the time. I'm not a fan of hills either.
With absolutely no disrespect to dkb; this sounds like the words of someone who's never ridden a QR fixed. I know this is a common sentiment, but a proper QR setup should not slip.
Sure, torque could be higher when using higher gearing than the same person would use on a geared bike, but I really doubt its higher than the TDF sprinters and climbers who've used QRs on horizontal drops for scores of years without this mysterious slipping.
FWIW - I've been using (prettymuch) exclusively QRs on my fix for 18 years w/out a single slip.