I've taken to fixed gear recently and love it. It still scares me a bit, though, because I feel like I don't have as much control in starting and stopping. Since I'm in my 40s I don't care much about fitting in with the hipsters who ride with no brakes. Thus, I built up my bike with a front brake and don't bother trying to skid stop. Do those of you who use rear brakes on your fixed gear bikes have any problems with them? I've heard some people say they're dangerous--something like they cause the rear wheel to lock up easily.