BMX

A BMX bike or BMX is the name of a popular bicycle used for both casual use and sport, and designed mainly for dirt and motocross cycling. "BMX" is the usual abbreviation for bicycle motocross.

BMX bikes are designed for stunts, tricks, and racing on hilly dirt BMX tracks. They have a single gear ratio with a freewheel and are built with smaller frames and wheels with wider, treaded tires.