BMX (Bicycle Motocross) is a form of cycling on specially designed bicycles which usually have 20 inch wheels. The sport includes racing on earthen tracks, known as BMX racing, as well as the performance of tricks on the bikes, called Freestyle BMX. Freestyle BMX has grown to include five distinct disciplines. These are Street, Park, Vert, Dirt, and Flatland. These usually involve technical movements of the bike in different ways over varied terrain.
A BMX bike intended for racing can be easily distinguished from a freestyle BMX bike.
- Freestyle Vert: shorter seat- and chain- stays, and typically a single brake for the rear wheel. Brakes commonly have a detangler mechanism to enable bar spins, but some riders opt for a single cable setup for ease of repair;
- Freestyle Street/Park: Similar set up to that of vert. Brakless riding is common. Also growing now is the use of freecoasters which allow the rider to ride fakie (backwards) without back-pedaling.
- Freestyle Dirt: Similar set up to street only on dirt jumps with tires that are more suited to dirt, most often running with a single back brake and no detangler. Toptube is usually longer than those used on street bikes, for better distance coverage.
Freestyle Flatland: shorter seat- and chain- stays, dual brakes with detangler mechanisms to enable bar spins. Low gear ratio. The bike is usually fitted with pegs and platforms for standing.;
- Race: Brakes rear, and frames with specific lengths for the riders size, they have thinner wheels for smaller riders for less drag, or thick tyres for larger riders which give more stability.
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