Actually you're thinking of a single speed here. A fixie is one that runs with a fixed gearing (without a freehub [0]. When the wheels turn the pedals must tur

Actually you're thinking of a single speed here. A fixie is one that runs with a fixed gearing (without a freehub [0]. When the wheels turn the pedals must turn. many hipsters also run them without brakes which requires them to use their legs to slow the bike. these are most commonly seen on velodromes and anywhere with lots of coffee shops. [0] http://en.wikipedia.org/wiki/Freehub http://en.wikipedia.org/wiki/Freehub