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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'. one of the first and best dirt jumping riders was tommy mathewman.He was born in adelaide in a suberb called unley.he first got in to riding in 1999. Dirt jumping can be done on almost anything with wheels, but it is usually executed on a bicycle.

Mountain bikes - 24 or 26 inch wheels and either rigid forks or forks with short front end suspension (usually 80-100 mm travel, but can be up to 254mm depending on the type of the bicycle)
Dirt Jump/Freestyle bikes look similar to mountain bikes but the top of the frame usually slants towards the back whee, this keeps the seat out of the way while performing tricks. The wheels are usually a lot stronger than a Cross-country cycling mountain bike's and the same for the frame. They are usually made with not too light and not too heavy materials e.g. cromoly, and have front suspension.
Freestyle Motocross (FMX, Moto-X) of various sizes & engine sizes.
BMX bike built for dirt jumping tends to have a longer top tube than a street BMX bike, and may well be more reinforced. They will rarely have pegs fitted (unless they are also used for street riding), and will generally run only a rear u-brake. Also, the tires will be treaded, as opposed to the slicks and semi-slicks used for park riding. Large, padded seats are also popular as something to land on when a trick fails, and are also easier to hold for in-flight tricks; but very small seats are also a style for the more "hardcore" riders. The gear ratio is generally around 44:16, though using small gearings like 22:8, known as 'micro gearing', has become popular in the present day.A photo of some BMX trails courtesy of barendbmx.co.uk

A mountain bike built for dirt jumping tends to has a smaller frame than what is used for other disciplines. Running singlespeed is very common, as is using only a rear brake. In modern times, 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 2:1 (32:16, 36:18 and 24:12 being its most popular incarnations) and rigid or 80-100mm travel forks. An 'all-round' bike used for dirt jumping will more likely have 26" wheels, a 30-36 teeth 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. A couple of the most commonly purchased bikes for the general purpose of dirt jumping include the Kona DirtJump series (Kona Shred, Scrap, Stuff, Cowan) or the P. series by Specialized (P.1, P.2, P.3, etc), and Norco Dirt And Street Series. Giant also has a StreetTrailPark line that is suitable for jumping, the STP 1-3 series.

History

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.

Types of jumps

Double the most common form of Dirt jumps. This consists of two separate earthworks, one acting as a takeoff(lip), and the other as a landing. Also known as a "gap" jump. They can be "Step-Ups", where the jump's upramp is lower than the down ramp or "Step-Downs", where the jump's downramp is lower than the upramp.
Tabletops are more common among those new to the sport, they are a single earthwork with a takeoff at one end, and a landing at the other, with a flat 'table' on the top. These are favoured by new riders because when the rider comes up short they can still easily ride out of it.
Ski jumps consist of just a takeoff, they're usually longer and flatter than other jumps, and tend to be situated on downhills, so the slope of the hill can serve as a landing. They're used mostly in competitions on jump length.
Roller a small tabletop that gives you extra speed by 'pumping' the jump. you usually find these at the beginning of a trail.
Step ups a ramp just before an incline to enable a rider to jump from the top of the incline.
Whoops/Rhythms a series of usually three or more small rounded ramps close together to enable a rider to 'manual' over them.
Spines one earth work with a take-off and a landing, but no table or gap, made to get higher air without distance.
Berm Basically a curved wallride that comes out of the ground. Mostly used on sharp turns in which helps you by giving you the ability to ride on your side. The curve allows you to make a sharper turn. Mainly used on downhill trails but, also used dirt jumping to avoid hitting trees. They are also used to maintain your speed without having to brake on turns. Some trails consist of jumps that lead into berms.
Hip Jumps This consists of the landing being anywhere within 0 - 90 degrees, left or right of the take off enabling you to transfer.

Famous riders

Ryan Nyquist
Reuel Erickson
Ryan Guettler
TJ Lavin
Mike Aitken
Sam Pilgrim
Will Guthrie
Kevin Martin
John Cowan
Andreu Lacondeguy
Lluis Lacondeguy
Lance McDermott
Cam McCaul
Jordan Lowth
Brandon Semenuk
Grant 'chopper' fielder
Darren Berrecloth
Aaron Chase
Tyler Klassen
Timo Pritzel
Matt Jenkins
Keko Colli
Arnau Puig
Marc Torelló
Igna Roca
Ferran Guardia
Ricard Puig
Marc Puig

External links

Freedom Riders First public freeride specifc trails in the United States.
UK Dirt Jumping
Dirt jumping wiki
Dirt Jumping Information and Forums
My Bmx.com's Bmx Dirt jump database
Dirt Jumping Videos
Pinkbike
picture of BMX Dirtjumping
Bike site from Gloucester
Guide to all things mountain biking, delivering user-provided reviews of mountain bike products, news and tips.
Hick Hucksters NC Based Site Promoting Freeriding
Australian Mountain Biking Website
NSW Dirt Jumping and Street Riding
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Name	Description
Tabletop	While in the air tipping the bike on its side to a 90° angle or further.
Euro Table	sometimes called a Darkside, 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.
Whip(Fish tail)	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.
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
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	Releasing & spinning handlebars one full rotation before catching them again
Tail Whip	kicking the bike while holding the handlebars so that it 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.
3-Star	Only one hand touches the handlebars, so the extended arm and legs form a star.
Backflip Tailwhip (Flipwhip)	As the name suggests, doing a tailwhip whilst upside down (halfway through) a backflip.
Flair	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.
Decade	Like a barspin, but person wraps around with the bars in a 360° position while tail stays straight.

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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'.
+one of the first and best dirt jumping riders was tommy mathewman.He was born in adelaide in a suberb called unley.he first got in to riding in 1999.
 Dirt jumping can be done on almost anything with wheels, but it is usually executed on a bicycle.
 * [[Mountain bike]]s - 24 or 26 inch wheels and either rigid forks or forks with short front end suspension (usually 80-100 mm travel, but can be up to 254mm depending on the type of the bicycle)