0 short for fixed-gear bike or fixed-wheel bike: a bicycle with only one gear (= a device that controls how much power goes to the wheels of a vehicle) that cannot move unless the pedals are being turned, often used for getting around a city:
For those who live close enough, just hop on your fixie and take advantage of indoor bike parking.
From a technological standpoint, trading the average mountain bike for a fixie is the equivalent of trading in a computer for an abacus.
If you yearn for a return to the classic styling of the bikes of yore, this steel fixie with leather trim ticks all the boxes.
Bike messengers are big fixie fans.
