The difference between a flat car and a street car! Although this article has been on the website for a long time, many people are still asking similar questions and may not find it. So I sent it again and made some changes. My personal level is limited, so I can't go into details, for reference only. I also hope that other friends can point out the shortcomings and make them perfect. Streetcar, a classified model of BMX stunt car. In extreme sports, streetcars are divided into parks, U-shaped boards (semi-tubes), streetcars and jumping (flat) floating cars, mainly flat fancy cars. In addition, there is the BMX family event in the 2008 Olympic Games, mud racing. Due to different uses, the design of racing cars is also very different from stunt cars. Its main feature is that the tooth speed is relatively large (the tooth plate is relatively large) and the flywheel is relatively small) to obtain high speed. The frame is longer because it doesn't need much force. It is mainly made of lighter materials, such as aluminum alloy and titanium alloy. Secondly, the tread pattern is thicker for better grip. Some racing cars use V-type brakes, which are outside the rear triangle. Such a car is not suitable for stunts. Car dealers everywhere, if they don't specialize in BMX, most of them can't tell these cars apart. Some people can tell the difference, but they still sell racing cars as stunt cars for profit. Many novices have suffered such losses. I hope that in the future, such things can reduce the frame: the flat frame is relatively short, and now the mainstream is to use curved upper and lower pipes in the front triangle, or simply break the previous triangular layout structure, create a special-shaped frame and increase the action space. The material is mainly steel, and a small amount of aluminum alloy and titanium alloy streetcar frames are longer. For strength reasons, the front triangle basically adopts the traditional straight triangle structure. Most of the materials are steel, and almost no other materials are used for rocket launchers: generally called auxiliary devices of rocket launchers, most street cars are made of steel or titanium alloy to withstand high-intensity movements such as sliding columns. The rocket launcher of a flat car with a smooth surface is used to provide a space for the driver to step on and grasp, so it does not need high wear resistance and strength, so it is made of aluminum. The surface is treated to increase friction, such as adding texture or attaching sandpaper to the toothed disc and crank. For short-distance actions that need to be accelerated, the number of teeth used by street cars is slightly larger, and the length of the crank is also slightly longer, generally175 mm. The flat car speed is less, the number of teeth is less, and the crank is shorter, so as to prevent some actions from bumping the feet, generally 165 to 168 mm, and the handlebars of floating cars are mostly straight (zero degree). Sometimes the handlebars of street cars can be used to play with floats, but the handlebars of floats are generally not used to play with street car poles: the handlebars of floats are relatively short, or some handlebars already have a pole structure that moves the handlebars forward to 0. This design makes the handlebar of the streetcar longer to increase flexibility. In order to facilitate the application of force when jumping, the material of the column is basically aluminum alloy front fork: most street cars jump, and the front fork needs to move forward, so as to provide stability and shock absorption by increasing the tread. The materials are all steel flat drift, paying attention to flexibility and control. The front fork does not move forward or move forward a little, and the front flower drum is located directly below or basically below the tangent line of the frame head pipe angle. The so-called straight fork or small angle fork. The material can be steel or other light materials. Sometimes street forks can be used to play with flat flowers, but no one has seen street seat bags with straight forks. Streetcar that emphasizes shock absorption has a large and soft cushion, but it is still one of the parts that are often damaged. The cushion of the float belongs to the function of the handle, and many actions need to be carried. Tire and steel wire: the tire used for street cars is more general. The tire in the picture is modeled after a locomotive. The tires for street cars are depressed, but it is necessary to prevent snakes from biting the tires caused by landing impact. Flat car tires have a circle of lines, mainly to increase the friction with the ground or sole when providing fancy performances, and its tire pressure can reach more than 140 PSI. At present, 48(36) steel wire for extreme BMX is quite common. Back flower drum: The back flower drum of flat car is very learned. The rear hub of a high-end car is equipped with a clutch, that is, a clutch shaft. When sliding backwards, the crank will not be as durable as the flower drum used in reverse street cars, and it is almost unnecessary to consider the influence of sliding backwards, but a few drivers use clutch shafts. For strength reasons, the axis of the rear hub of a streetcar is usually 14MM, but in order to reduce the weight of flat cars and racing cars, it is usually a 3/8 inch (about 10MM) rear axle protector: a streetcar project with speed and impact. In terms of protective gear, knee pads, elbow pads, gloves and helmets have been added. Helmets can also be selected according to different projects. The protective gear used on the float is as casual as freestyle. Pedal is the most deadly part, and the protective gear for protecting the calf is one of the most basic equipment for extreme riding. Brake: A streetcar with front and rear brakes can make various handle rotation modes in the air through the cooperation of wiring and rotator. Some drivers use long pipes instead of turning, and the length of the brake line can make the handlebar turn more than three times, which can meet the requirements of most drivers. The flat car is light in weight and simple in structure, and there is no need to install a rear brake (even if there is no brake). The front and rear brakes are mainly suspension brakes, and the suspension brakes with smooth braking feel are still the mainstream in extreme BMX, while V-type brakes are not suitable because of their high sensitivity. The position of the rear brake is mostly hidden in the rear triangle to avoid occlusion. Streetcar design is mainly based on strength and suitability for jumping, while flat flowers are mainly flexible. These characteristics are reflected in many accessories. Whether it is a street car or a float car, lightweight is very important. There are many experts in this forum in wwwchinabmx.com.cn. Go and have a look! ! You can buy a suitable car there.