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A typical dirt jump-mountain bike. Dirt jumping uses a specific kind of bike. BMX, for instance, has a range of bikes built for this activity. One of its key differences from general purpose bikes is the fit. There is only one standard BMX dirt jumping bike frame, which is meant to fit all riders, young and old. [2]
Freestyle motocross (also known as FMX) is a variation on the sport of motocross in which motorcycle riders attempt to impress judges with jumps and stunts. The two main types of freestyle events are: Big air (also known as "best trick"), in which each rider gets two jumps — usually covering more than 75 ft (22.8 m) — from a dirt-covered ramp.
Trails are paths that lead to jumps made of heavily compacted dirt. Jumps in the same path, or "line", are sometimes referred to as packs, such as a four pack, a six pack, or an eight pack, which would have two, three, and four jumps respectively. A dirt jump consists of a steep take off, called a lip, with an often slightly less steep landing.
This jump would have been equivalent to the length of an American football field from goalpost to goalpost. [8] [9] On a practice jump, Harvill crashed into the top edge of the dirt landing ramp and was thrown from his bike, [7] flying 20 feet (6.1 m) and losing his helmet. [8]
Jumps are often incorporated into freeriding. The original freeride bikes were modified downhill bikes that used gearing that enabled the rider to go up hills as well as down them. Modern freeride bikes are similar to downhill bikes, with the same amount of suspension in the form of a dual crown fork, with 40 millimeter stanchions.
Linkogle holds the world record for long-distance motorcycle jumps and has appeared in feature films as a stuntman. He is regarded as a founder of freestyle motocross. [2] Metal Mulisha is one of the most-recognized freestyle motocross teams in the world and is an internationally known lifestyle apparel line.
Supermoto uses motocross bikes converted for racing on tracks consisting of three sections: flat dirt, dirt obstacles, and paved road. The bikes have special road-racing tires with grooved tread to grip both the pavement and dirt. Some tracks for these race events have jumps, berms, and whoops like motocross tracks.
Prior to the failed practice jump, Knievel jumped either cars or trucks (or a combination of the two) on the XR-750. [17] Bubba Blackwell's Harley-Davidson XR-750 jump bike. The longest jump Knievel made over cars was 129 feet over 19 cars in 1971 and was featured in the movie Evel Knievel starring George Hamilton. [18]