Once upon a time, on a college campus, I heard some people talking about their "fixies". I had no idea what they were talking about, and didn't want to admit to my ignorance by asking.
In order to keep you from the same ignorance, let's talk today about what a fixie is. "Fixie" is short for "fixed gear". In short, a fixie is a bicycle that has a drivetrain with one gear that is fixed to the rear wheel. This means that when you are riding a fixie you cannot coast, but have to continue pedaling whenever you want your bike to move.
Fixies are popular because they are the most simple of bicycles. Unlike other cyclists, a fixie rider doesn't need to worry about derailleurs, double or triple cranksets, shifters, or (in some cases) brakes.
Since you only have one gear on a fixie, choosing the best gear for yourself is very important. Factors to consider include how fast you pedal, where you are riding (flat roads? hills?) and how strong of a rider you are.
Fixies are the ultimate in bike simplicity.
Stay tuned for reasons why you should get one!