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The fixed-gear bike, commonly known as a fixie is a bike that has a drivetrain with no freewheel mechanism. The freewheel was developed early in the history of bike design but the fixed-gear bike remained the standard track racing design. More recently the 'fixie' has become a popular alternative among mainly urban cyclists, offering the advantages of simplicity compared with the standard multi-geared bike.
Most bike incorporate a freewheel to allow the pedals to remain stationary while the bike is in motion, so that the rider can coast, i.e., ride without pedalling using the forward or downhill energy of the bike and rider. A fixed-gear drivetrain has the drive sprocket (or cog) threaded or bolted directly to the hub of the back wheel,so that the rider cannot stop pedalling. When the rear wheel turns, the pedals turn in the same direction.This allows a cyclist to apply a braking force with the legs and bodyweight, by resisting the rotation of the cranks. It also makes it possible to ride backwards although learning to do so is much more difficult than riding forward.