What is it exactly that’s so great about riding a singlespeed? What draws people to it, and what makes them abuse their own knees like that? I’ve built and ridden a couple of singlespeeds recently, and I’ve been thinking about what makes them so much fun. Part of it has to be nostalgia, of course. Most of us have fond memories of a particular bike from our childhood, and chances are pretty good it was a singlespeed (if not a fixed gear).