Fixedgeargallery and sheldonbrown are excellent company! Subscription is required to read the full article.
Forget about 28-speed mountain bikes, cruisers with huge seats or $3,500 bicycles that shift gears automatically. Cyclists seeking an adrenaline boost on their commute are increasingly climbing onto a model straight out of the 19th century: a bike that has just one gear, can't coast and often lacks a feature prized by most cyclists and law-enforcement officials -- brakes.
Taking a cue from velodrome racers and city bike messengers, a growing number of riders are buying so-called fixed-gear bikes. Unlike standard 18- or 21-speeds, fixed-gear models have pedals chained directly to the rear wheel so that whenever the wheel spins, ...
Sites including fixedgeargallery.com, cyclelicio.us and Sheldonbrown.com contain tales of stuck digits, even pictures of severed fingers.