I have no idea why people want to ride fixed gear (single speed is much better if you must stick to one speed)
1) You can't coast on fixed gear, so you are always pedaling and wasting extra energy. this sucks when the ground is flat and when going downhill.
2) You are slower than a multispeed or single speed bike (no coasting + hills will get to you)
The only things fixed gear has going for it is
1) No brakes/brake levers needed (save money)
2) Fat people, they work thier fat buttz and keep pedaling if they want to keep moving (no more coasting at 2 mph on the sidewalk for these guys anymore lol)