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.[1] 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 tricks with the style. Dirt jumping can be performed on BMX bikes or specialized mountain bikes known simply as "dirt jumpers".
^Rosenberg, Aaron (2005). Dave Mirra: BMX Superstar. New York: The Rosen Publishing Group. p. 10. ISBN1404200673.