Solid-Axle vs Quick Release
Conventional wisdom is that you need a solid (nutted or "bolt-on") axle hub for fixed-gear or singlespeed use, and that a quick-release will not hold the wheel solidly enough in a horizontal forkend. This is not true, however.
Since most newer bikes have vertical dropouts, people have gotten used to wimpy aluminum skewers, and often don't adjust them as tightly as they might.
If you use a good quality (Shimano is the best) skewer, tightened securely, it will hold just fine in any type of dropout or forkend.
A quick release is a considerable timesaver in switching a flip-flop wheel around, and having a QR means that you don't need to carry a big wrench to be able to replace a damaged inner tube.
this is from the legendary sheldon brown;
Solid-Axle vs Quick Release
Conventional wisdom is that you need a solid (nutted or "bolt-on") axle hub for fixed-gear or singlespeed use, and that a quick-release will not hold the wheel solidly enough in a horizontal forkend. This is not true, however.
Since most newer bikes have vertical dropouts, people have gotten used to wimpy aluminum skewers, and often don't adjust them as tightly as they might.
If you use a good quality (Shimano is the best) skewer, tightened securely, it will hold just fine in any type of dropout or forkend.
A quick release is a considerable timesaver in switching a flip-flop wheel around, and having a QR means that you don't need to carry a big wrench to be able to replace a damaged inner tube.
http://sheldonbrown.com/singlespeed.html