Fixed Gear Bike
A fixed-gear bike (or fixed wheel bicycle), is a single speed bicycle without a freewheel. The cog is ‘fixed’ to the hub, usually secured by a reverse-thread lockring. The complex system of chainrings, cogs and derailleurs essential to the operation of a multi-gear bicycle is completely absent on a fixed-gear bicycle, granting it a simplicity of operation and repair as well as a clean, aesthetic appearance.
Fixed gear bicycles cannot coast. Whenever the rear wheel is turning the pedals turn in the same direction. By resisting the forward motion of the pedals, a rider is able to slow the bike to a stop, without the aid of a brake. They can also be ridden in reverse, although the forward-oriented geometry of any bicycle makes this more of a stunt than a practical technique.
Fixed Gear Bicycle Uses
Fixed-gear bikes are most commonly track bicycles used for track cycling in a velodrome, but many fixed-gear bikes are suitable for on-road or off-road use. Track bicycles, in addition to having a fixed single gear, also have frames designed to facilitate an aerodynamic riding position and other features desirable for velodrome racing. Because it is possible to stop a fixed-gear bike by resisting the turning pedals, brakes are not strictly necessary, but many cyclists retain at least a front brake for safety in traffic and for safety in the event of a broken or derailed chain.
A skilled rider can lock the rear wheel and skid to slow down or completely stop on a fixed-gear bicycle, a maneuver sometimes known as a skip stop. It is initiated by unweighting the rear wheel while in motion (and usually lifting it off the ground slightly) by shifting the rider’s weight forward and pulling up on the pedals using clip less pedals or toe clips. The rider then holds the pedals in a horizontal position, thus stopping the drive-train and wheels, while applying his or her body weight in opposition to the normal rotation of the pedals. When the rear tire again contacts the ground the rear wheel will skid, which acts to slow the bike. The skid can be held until the bicycle stops or until the rider desires to continue pedaling again at a slower speed. Mastering the technique requires practice and using it while cornering is generally considered dangerous.
