In case you aren’t aware of what a fixed gear is, here’s the definition from the most trusted source on the internet.(Wikipedia)
A fixed-gear bicycle (or fixed-wheel bicycle, sometimes known in the USA as a fixie) is a bicycle that has no freewheel, meaning it cannot coast — the pedals are always in motion when the bicycle is moving.
The sprocket is screwed or bolted directly onto a fixed hub. When the rear wheel turns, the pedals turn in the same direction. This allows a cyclist to stop without using a brake, by resisting the rotation of the cranks, and also to ride in reverse
On April 30, San Francisco’s Justin Herman Plaza will serve as the setting for a collision of fixed gear biking and urban contemporary art, creating a visually exciting and awe-inspiring event called Red Bull Ride + Style. The event will feature riders facing off in both track and freestyle competitions, with the obstacles designed and decorated by local San Francisco artists. Red Bull Ride + Style will bring together more than 50 riders from both coasts, with riders from fixed gear meccas San Francisco, Portland and New York competing, as well as riders from Japan.