I came here with a really old bike last year. It was an old fixed gear with a break system that made you have to jerk the pedals back in order to stop. The staff here were very knowledgeable and, although they didn't have the parts to help me, let me know how I could fix my problem temporarily (the bike was so old that probably finding the part may prove to be more expensive in the long run).
If you have bike questions and need a space with tools to tune up your wheels, come here. You will not be disappointed.