A Fixed-gear bicycle is most commonly a vintage steel road style bicycle utilizing one gear combination with the rear sprocket "fixed" to the rear wheel. Fixed gear bicycles are incapable of coasting, moving and not pedaling. This type of transportation is used by urban bicycle messengers, as it is a trusty and reliable form of transport, plus it's just cool.
Tricycle, Track bicycle, Penny farthing bicycle
Lobster road to the market in the snow on his fixed-gear bicycle.