Bike for dirt: the main characteristics, selection rules

Since its inception, and to this day the bike went through many changes. First it was a primitive design, and now there are models that are not called otherwise than a miracle of engineering. For a long time the Bicycle was unchanged. And went on this truck exclusively on smooth roads. But in 1970, invented the mountain bike (mountain bike), and it was a real revolution in velosipedisty. On a mountain bike to explore the terrain that was previously inaccessible to cyclists. Over time, the Cycling appeared different disciplines associated with mountain Biking. Today gained much popularity dirt-jumping and street-trial. Let's find out what should be the bike that it was possible to do these sports.

General concepts

Dirt jumping is literally translated as “jumps in the mud”. Basically, the way it is. Cycling is carried out on a specially prepared track, which consists of ground trampolines. Rapid takeoffs, landing soulful, dizzying flights – that's what's expected of spectators at the track for dirt. Well, in street, the trial for tricks used earthen mountains, and elements of urban topography. Both sports require a great command of the bike (so called not only the motorcycle, but Bicycle). Discipline similar level of load transport, but there are some differences.

Bike for dirt and street: key features

For jumping uses modified mountain bikes and BMX. Or something between these two species. As a rule, they pretty much weigh, and brake – rear.

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The Bike for jumps always has only one gear. However, many manufacturers are positioning Multispeed bikes as derevya or startovie. Such models should be excluded from the list of options under consideration when choosing a bike. If the bike has multiple gears, the manufacturer is likely to save on the quality of the frame and other important components. In addition, in these disciplines switch gear is completely useless. It only increases the weight of two-wheeled transport and its cost.

For the beginner it is quite suitable commercially released bike for dirt. Such models are also called “complicada”. And more experienced athletes and those who are well-versed in the details and specifics of their work, collect their stories to themselves of the most suitable elements, or tuning your komplit. Discuss the most important elements of the bike separately.

Frame

This is the most important and expensive part of any bike. Key features frame – the geometry and material of manufacture. It depends on them the quality of the frame and its suitability in a particular sport.

Bike for dirt or street should be resistant to extreme loads. So the strength of the frame is in the first place. In their manufacture is used such materials:

1. Hi-Ten – steel of high quality. It usually used in the manufacture of inexpensive completos. Frame made of this material, has impressive weight, but not strong enough. Therefore, the tuning of this bike start from it.

2. Alloys of aluminium. Frame made of this material weighs less and is practically not subject to corrosion. However, it can not fully absorb shocks and poorly repaired. Over time, during active operation, aluminum accumulates fatigue. Sooner or later it leads to the destruction of the frame. However, among fans of jumping on the bike, there are many fans of aluminum frames.

3. Alloy steel. In these frames uses the CR-mo alloys. The product of this material well absorbs the energy arising in the landing, and softens blows. In the frames of alloy steel of medium and high class often use tubes with non-uniform wall thickness. This allows you to increase the strength and reduce the weight.

4. Magnesium and titanium alloys and composites – the highest quality materials for their frames. But to afford them, as a rule, only professionals.

Thus, we can conclude that the best bike for dirt and street – the frame which made of stainless steel. It provides optimal ratio of strength to weight. Aluminium also has a lot of fans, but it is more suitable for disciplines in which no ultra-high loads and any impacts.

Frame Geometry

Special attention deserves such a time as frame geometry. Just here appears the main difference between a dirt bike from a street bike. Unlike other disciplines, the length does not play a special role. The fore top tube length.

For dirt Bike has a relatively large size. Front triangle of the frame usually has a length of 570-590 mm. the Rear triangle is also quite long – 370-410 mm. Smooth landing provides a specific angle of inclination of the steering column – 68-70 degrees. In street trial this design would increase the duration of the flight, but would preclude “pulling” bike. Street bike, on the contrary, has the shortest front (about 545 mm) and rear (345-350mm) triangles. And tilt steeringcolumn here is 71-74 degrees.

The Lower feather dirt bike parallel to the ground or have a negative angle of inclination. Thus, the carriage or is on the same level with the rear axle, or slightly below it. This design allows lowering the center of gravity of the bike, which positively affects the dynamics of acceleration and makes flight more stable. In addition, bike for dirt jumping with this frame geometry is better controlled on the road with dynamic cornering.

The Carriage street-bike located higher up, which makes it easier to “pull” the bike and install on the rear axle peg. Excessive increase the height of the carriage is not necessary. This will make the bike unfit for flying and would lead to a loss of stability. Usually in the bike for dirt and street use horizontal dropouts, which make it possible to change the length of the wheelbase.

Wheels

Another point that often is controversial – selection of wheels. On the bike for dirt and street, as a rule, put wheels with a diameter of 24 or 26 inches. Bike 24-inch wheels more versatile. It can be suitable for both disciplines. By the way, sometimes on dirt-bike, put two different wheels: 26-inch forward and 24-inch ago. In General, dirt is more suitable for the latter option. These wheels better handle uneven surface and soften the landing.

Bike street, by contrast, is better behaved with 24-inch wheels. They are easier to do tricks because they are lighter and smaller. Bike on small wheels is much more compact. He easily picked out and more responsive to steering movements.

The Choice of diameter also depends on the growth of the athlete. If you're above 180 cm, feel free to buy bike wheels 26 inch. Well, if it is below – 24. In dirt use tires with a strong tread or polyline. And in the street – slicks or polyline. Bike for jumping must have wheels with double rims.

Fork

Another important element of the bike. Street bike, and dirt, usually, it's the beginners who have sporting ambitions, after about six months. During this short period of time the joints of the rider can get severe damage if he chose the wrong fork.

These elements are of two types: hard and amortization (short-stroke). Soft plug with a stroke up to 13 cm perfect for fans of aggressive style with long flights and landing on a flat surface, as well as newcomers. But this product is quite expensive. On completo for beginners usually are the cheapest suspension fork with a single crown.

On a street-bike that is used for low jumps, it is better to install a lightweight rigid fork. It will allow to use the amplitude of the departure and better control of the bike. Another advantage of this solution – a significant savings. It is important that this plug is made of chrome-molybdenum alloy or HNWI.

Accessories are considered under the axis of 14-20 mm. They are quite durable and reliable. It is not necessary to put on the bike for jumping the plug under the axle 10 mm thick – it will quickly fail.

The Wheel and the takeaway

The size of the rudder depends on the width of the shoulders and physical preparation of the athlete. For larger riders will fit handlebars with a width of 700 mm or more. Well, the average person will be enough width of 680 mm.

Bikes with a rigid fork set chromalive the handlebars, and if the plug is soft, suitable and aluminum. The height depends on personal preferences, but, as a rule, rigid forks put the handlebars higher, than soft.

For the jump bike is the perfect short takeaway with a length of 35-50 mm. This bike is good, because hands are close to the center of gravity. Riders with a larger build, you can put the take-out longer.

Brake

The Type of brakes, in principle, not important. The important thing is, they are on the bike or not. Nekotorye athletes go generally without brakes, but for beginners it is better not to hurry to remove the node. At the right time it can protect you from serious injuries. Bike street or dirt can be equipped with even simple wybrakowany brakes, but it is better to install the disk.

Saddle

Here all is simple: the saddle should be wide and soft. Narrow does not work clamp foot when jumping. And hard will fight on your knees, causing discomfort.

Security

Before you start to do extreme Biking, be sure to purchase protection. First you need to choose a helmet. You can take the so-called fullface, but it weighs a lot, much floating and obstructing his vision. Therefore, it is best to buy a simple helmet-pot.

Next you need to take care of the protective brushes for the knee and elbow joints, and also shins. And don't forget to buy gloves.

Bikes for street/dirt: price

These sports are widely spread, and therefore, the market has a large selection of bicycles, parts and clothing. The price of the bike for jumping sport varies depending on quality and packaging details. Bike for a beginner costs from 300 to 1000 dollars. In General, as you probably know, sky's the limit.

Conclusion

Choosing a bike (street or dirt youlike – does not matter), you will face a lot of nuances. An understanding of the need of a particular detail will come with experience. There are some issues that have for years debated among riders. The important role played by personal preferences of the athlete. Starting to ride and soak up the atmosphere of extreme sports, you will quickly learn all the nuances of this exciting class. And don't forget that the path to expertise is only through regular exercise.