
BMX, an abbreviation for bicycle motocross or bike motocross, is a cycle sport performed on BMX bikes, either in competitive BMX racing or freestyle BMX, or else in general on- or off-road recreation. BMX began when young cyclists appropriated motocross tracks for recreational purposes and stunting, eventually evolving into specialized BMX bikes and competitions.
A BMX bike is an off-road sport bicycle used for racing and stunt riding. BMX means Bicycle Motocross.

BMX racing is a type of off-road bicycle racing. The format of BMX was derived from motocross racing. BMX bicycle races are sprint races on purpose-built off-road single-lap race tracks. The track usually consists of a starting gate for up to eight racers, a groomed, serpentine, dirt race course made of various jumps and rollers and a finish line. The course is usually flat, about 15 feet (4.6 m) wide and has large banked corners, which are angled inward, that help the riders maintain speed. The sport of BMX racing is facilitated by a number of regional and international sanctioning bodies. They provide rules for sanctioning the conduct of the flying, specify age group and skill-level classifications among the racers, and maintain some kind of points-accumulation system over the racing season. The sport is very family oriented and largely participant-driven, with riders ranging in age from 2 to 70, and over. Professional ranks exist for both men and women, where the age ranges from 18 to 40 years old.

The bunny hop or bunnyhop, is a bicycle trick that allows the rider to launch their bike into the air as if jumping off a ramp. The pedals on the bicycle seem to stick to the rider's feet as the bike becomes airborne, much like how a skateboard seems to stick to the feet of the skater performing an Ollie. While the bunny hop can be quite challenging to learn, once mastered it opens up a whole new level of riding opportunities for both BMX and mountain bike rider alike.
The detangler, Gyro or rotor is an invention for the freestyle BMX bicycle, allowing the handlebars to turn a complete 360° rotation without the brake cables getting tangled up. A detangler is usually only used for the rear brake cable. The front brake cable can be routed through the stem, via a hollow stem bolt known as a Pott's mod bolt, and fork steer tube to avoid the tangling problem.

Dirt jumping is the practice of riding bikes over jumps made of dirt or soil and becoming airborne. Dirt Jumping evolved alongside BMX racing and is similar to BMX or Mountain bike racing in that the rider jumps off of mounds of dirt, usually performing a midair trick in between. It differs in that the jumps are usually much larger and designed to lift the rider higher into the air. Additionally, the goal is not to complete the course with the fastest time, but rather to perform the best tricks with the best style. But dirt Jumpers are not Off-road BMX’s.

Flatland is a freestyle BMX riding style performed on smooth flat surfaces that do not include any ramps, jumps, or grindrails. It is sometimes described as a form of artistic cycling with a blend of breakdancing.

This is a glossary of terms and jargon used in cycling, mountain biking, and cycle sport.
Mongoose is a brand name of bicycles originally designed, manufactured, and sold by BMX Products, Inc. It is now available through the distributor Pacific Cycle.

Mountain bike trials, also known as observed trials, is a discipline of mountain biking in which the rider attempts to pass through an obstacle course without setting foot to ground. Derived from motorcycle trials, it originated in Catalonia, Spain as trialsín and is said to have been invented by the father of Ot Pi, a world champion motorcycle trials rider. Pi's father had wanted his son to learn motorcycle trials by practicing on an ordinary bicycle.

A pump track is a circuit of rollers, banked turns and features designed to be ridden completely by riders "pumping"—generating momentum by up and down body movements, instead of pedaling or pushing. It was originally designed for the mountain bike and BMX scene, and now, due to concrete constructions, is also used by skateboard, and accessible to wheelchairs. Pump tracks are relatively simple to use and cheap to construct, and cater to a wide variety of rider skill levels.

The tailwhip is a bike trick typically performed on a BMX, in which the frame of the bike performs a complete rotation around the front end, which remains stationary throughout the move. The same trick may also be performed on a kick scooter.

Torker is a brand of bicycles and unicycles currently owned by Seattle Bike Supply, headquartered in Kent, Washington.