About me: The fixed-gear bicycle is the grandfather of every
bike you see today: Before derailleurs and
freewheels, there was one ever-spinning gear. The
Tour de France was a fixed-gear event up until
WWI, and today’s fixed-gear enthusiasts use
the bikes for track and criterium racing, time
trials, and bike messenger use. Most riders,
though, just enjoy the experience of mashing the
pedals to go and pulling up on them to stop;
it's the purest interference between you and
the bike.