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Dirt jumping is one of the names given to the practice of riding bikes over cement type jumps of dirt or soil and becoming airborne. The idea is that after riding over the 'take off' the rider will become momentarily airborne, and aim to land on the 'landing'.
Dirt jumping can be done on almost any vehicle with wheels, but it is usually executed on a dirt jump bike.
* Dirt Jump/Freestyle mountain bikes look similar to mountain bikes but have a rigid frame and, a lower stand-over height, this keeps the seat out of the way while performing tricks. The wheels are usually more robust than a cross country mountain bikes and the same for the frame. Frames are built for a balance of strength and lightweight.
A mountain bike built for dirt jumping tends to have a smaller frame than what is used for other disciplines. Running singlespeed with one break is very common. using single or dual disc brakes has replaced the use of only one rear V-brake. In general, a mountain bike dedicated to dirt jumping will have 24" or 26" wheels, a gear ratio of approximately 60 gear inches (~36:15 on a 24" rear wheel or ~36:16 on a 26" rear wheel) and rigid or 80-100mm travel forks. An 'all-round' bike used for dirt jumping will more likely have 26" wheels, a 25-36 tooth chainring with a wide-ratio cassette and a short- to mid-travel fork. Mountain bike dirt jumpers are usually split on the basis of wheel size because the wheel size dictates the shape of the takeoff to an extent. Dirt Jump bikes are made by a variety of companies. Examples of commonly purchased bikes for the general purpose of dirt jumping include the Kona Shonky or Cowan, (Kona also have a line of trail oriented bikes that are also suited for dirt jumping, the Shred and Stuff) Specialized P.1, P.2, P.3, Norco 125, 250, Havoc or Ryde, Transition's Trail-or-Park, Bank or Double, Giant Brass or STP, Devinci District, Haro Thread and Porter, Blk Mrkt Mob, Riot, Contraband, Killswitch, Soldier or Malice, NS Majesty, Suburban or Capital, Dobermann Pinscher or Molosse, Trek Ticket Signature, Eastern Nightrain, Thunderbird, and Mad Dog, the Banshee Amp or Rampant, and khs DJ and sj series, khs, a company based out of California, lesser known but makes a great selection of bikes. a 20 inch BMX bike for dirt generally has a 48 spoke rear rim and a 36 spoke front to prevent rim collapse in the case of casing a jump. the frame is a little bit longer to aid in more stability and to spread the load of heavy lands. most of these "micro geared" bike run 85 to 100 psi tires. these are usually threaded and made with kevlar bead to prevent pressure flats and tears.
Dirt Jumping evolved alongside BMX racing from its birth. Dirt Jumping is similar to BMX or Mountain bike racing in that the rider jumps off of mounds of dirt. 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. Trails are most often hand built, with attention to detail. Dirt jumping has evolved a lot over the years now, there are now competitions that you can compete in for prizes. The dirt jumps have become much larger and better built. They now use diggers and other machines to help build and compact the dirt quicker and more efficiently. The dirt jumps which are sometimes even built with wood can even be up to between 20 and 30 feet long for the professionals. The tricks have evolved a lot partly due to freestyle motocross evolving where a lot of the dirt jumpers get their inspiration from. When it first started it would be just tabletops and whips as the main tricks, now nearly every professional can back flip, front flip and even double back flip. Or what ever trick the rider is more comfortable doing
|Tire grab||While in the air, the rider grabs his/hers front tire|
|Tabletop||While in the air tipping the bike on its side to a 90° angle or further.|
|Euro Table||Sometimes called a Dark side, a euro table is when you turn your handlebars downwards instead of upwards as you would in a table.|
|Invert||Essentially a table, but over extended. possibly enough for the front tire or fork to rub on your shoulder.|
|Unturndown||Similar to an Invert, but the riders legs remain straight and the seat tend to wrap around the riders outside leg.|
|Whip||Keeping the front of your bike straight while flicking the back to one side. There are many different styles of whips, each depending on the style of the rider.|
|ET||Pedaling forwards, one full rotation in the air|
|Autistic Air||Et and do a two-star at the same time.|
|Cannonball||Taking both feet off the pedals and grabbing the seat with both hands|
|Tuck No Hander||Both hands off the handlebars with your legs pinching top tube and your bars in your lap.|
|Suicide No hander||Hands behind back while in the air with legs pinching seat.|
|Toboggan||One hand off handlebars touching the seat or top tube, one hand turning bars 90°. Tilt front down for extra style.|
|No footer||Both feet off pedals.|
|One foot can||One foot taken off and put over top tube to the other side of bike|
|No-footed Can-can||Similar to one foot can except done on both sides so that both legs are together, off the pedals and on the same side of the top tube|
|Nac-Nac||Similar to the One foot can, except your leg goes behind your other one still on the pedal, instead of in front.|
|Backflip||Rotating bike and rider completely upside down & continuing to rotate 360° of vertical rotation until facing original angle/direction. Can also be performed twice (while still in the air) to make a double back flip.|
|360||Rotating the bike and rider completely round 360° horizontally until facing original direction.|
|Front flip||Inverse of a back flip|
|X-up||Turning the bars 180° or further without releasing the handle bars to make the riders arms form an X shape|
|Barspin||Using one hand to guide the handlebar around one full rotation (360 Degrees).|
|Tail Whip||Kicking the bike while holding the handlebars so that the frame makes a 360 degree rotation while the rider does not rotate|
|Turndown||Similar to an x-up but the entire body turns with the bars and the bike frame is as vertical as possible. Variation on the "cross-up" which incorporates elements of both the "Table" and X-up.|
|Superman||No footer with feet extended out to the back, in a Superman position.|
|Superman Seatgrab||A standard superman but with one hand on the seat rather than the handlebars|
|Nothing||Nothing is touching the bike, neither arms nor legs, hence the name.|
|Superflip||Superman while backflipping.|
|2-Star||Forming a semi-star with one hand, and one foot (Usually opposites)|
|3-Star||Only one hand touches the handlebars, so the extended arm and legs form a star.|
|Dangler||Only one foot on one pedal with both hands taken off the bars, a variation of the "3-star"|
|Mays||When in mid-Air the universal audio symbol is made with the hands and feet.|
|Backflip Tailwhip (Flipwhip)||As the name suggests, doing a tailwhip whilst upside down (halfway through) a backflip.|
|Flair||Invented by Mat Hoffman, more commonly a bmx trick, this can be also be done on a mountain bike. It involves getting substantial air off a vert ramp, then doing a backflip and 180 so that you roll down the ramp going back the way you came.|
|Truck Driver||Doing a 360 and barspin combination, when the bars spin in the opposite direction of the 360.|
|Decade||Like a barspin, but person wraps around with the bars in a 360° position while tail stays straight.|
|Orbital 360||Like a regular 360, but the rider dips the front of the bike down so that both the rider and the bike are vertical during the rotation, the end of the rotation generally feels and looks a bit like a backflip.|
|California Roll||Invented by Mike Montgomery, this is where the rider does a 360 around his bike, it is similar to a body varial however the rider does not touch the bike during the rotation.|
|Cliff Hanger Backflip||Invented by Mike Montgomery, this is where the rider does a no hander but holds on the handlebars with their feet, while in a rotation of a backflip.|
|Flip Double whip||Invented by Greg Watts, this is where the rider does a back flip and two tail whips whilst in the air .|
|Truck Driver Tailwhip||Invented by Martin Soderstrom, this is where the rider does a Truck Driver and a tailwhip, which is when the rider does a 360 barspin to tailwhip.|
|360 Downside Tailwhip||Invented by Tyler Mccaul, this is where the rider does a 360 and a tailwhip in the opposite direction.|
|Special Flip||Invented by "Special" Greg Powell from Nitro Circus. This is where the rider performs a backflip while the bike stays flat.|
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