In the UK until the 1950s it was common for riders to use fixed-gear bicycles for time trials. Some road racing and club cyclists use a fixed-gear bicycle for training during the winter months, generally using a relatively low gear ratio, believed to help develop a good pedalling style. Ī track bicycle or track bike is a form of fixed-gear bicycle optimized for racing at a velodrome or at an outdoor track. Most fixed-gear bicycles only have a front brake, and some have no brakes at all. For example, a Sturmey-Archer fixed-gear three-speed hub is a fixed-gear multi-speed arrangement. Gear selection can, however, be accomplished with the use of an internally geared hub. A derailleur for gear selection would introduce chain slack, which would interfere with braking. It also makes it possible to cycle backwards.Īs a general rule, fixed-gear bicycles are single-speed. This direct coupling allows a cyclist to apply a braking force with the legs and bodyweight, by resisting the rotation of the cranks. During acceleration, the pedal crank drives the wheel, but in other situations, the rear wheel can drive the pedal cranks. A fixed-gear drivetrain has the drive sprocket (or cog) threaded or bolted directly to the hub of the back wheel, so that the pedals are directly coupled to the wheel. Most bicycle hubs incorporate a freewheel to allow the pedals to remain stationary while the bicycle is in motion, so that the rider can coast, i.e., ride without pedalling using forward momentum. More recently the "fixie" has become a popular alternative among mainly urban cyclists, offering the advantage of simplicity compared with the standard multi-geared bicycle. The freewheel was developed early in the history of bicycle design but the fixed-gear bicycle remained the standard track racing design. This tool incorporates a lockring spanner for securing a reverse threaded lockring against the sprocket.Ī fixed-gear bicycle (or fixed-wheel bicycle, commonly known in some places as a fixie ) is a bicycle that has a drivetrain with no freewheel mechanism. Track sprockets are typically attached and removed from the hub by screwing them with a chain whip.
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