BMX Bike
Bicycle Motocross or BMX is a name of a cycling sport in which the main goal is extreme racing on bicycles in Motocross style on tracks with inline start and expressive obstacles. BMX bikes are gearless, and have a relatively small frame (low to the ground) compared to the size of the rider. Handle-bars are usually U-shaped, rising up quite a bit above the frame. BMX bikes are tough, they have to be. Wheel diameter is usually 20' (children's/teen's BMX), but sometimes 24' (adult size). SPD/clip in pedals are sometimes used, but most riders prefer simple open-faced pedals.
There are three basic types:Race
Ideally fitted with frame pads to protect the rider. The frame is very light weight, typically a chrome-alloy or maybe aluminium, the wheels are relatively (for a BMX) narrow-rim and lightweight. Knobby tyres, but less treads than dirt BMX. Usually only one strong rear brake. these bikes are generally made of chromoly steel or aluminum. Chromoly frames are a bit heavier and more economical. Aluminum frames are lighter and are often made of oversize or exotically shaped tubing. Besides weighing less, aluminum is also rustproof. So, if you scratch your frame, there's no need to rush to touch it up. BMX bike frames come in a range of sizes, mostly geared towards child and teen sizes, as it is primarily a young person's sport
Freestyle Stunt
These bikes have heavier and more durable frames, with heavy steel content. Rather than racing, the freestyle bike's ideal use is for flatland tricks, aggressive street riding and getting vertical at skateparks. It's also a great bike for riding to school, the store and the pool. Super-sturdy construction is a higher priority than light weight. The wheels are usually either "mag" wheels made of sturdy nylon or heavy-duty models with 48 wire spokes. They are fitted with wider rim wheels and usually at least two brakes. Fitted out with stunt pegs on the back wheel, and designed such that the forks can be spun around easily, these are often a teenager's first choice of wheels.
Dirt Jumpers
Dirt Jumpers (also known as jumpers) are designed for taking flight. They also bridge the wide gap between BMX bikes and freestylers These are sort of a mix of the last 2, lighter than freestyle, but tougher than a race bike. One brake, meant for messing around in muddy woods, deep tread tyres. They usually don't have front brakes and their brawny wheels normally feature 36 rugged 13-gauge spokes, rather than resorting to 48 spokes the way freestyle bikes do. They are occasionally equipped with 24-inch wheels, which are a great choice for larger riders. The tires are the most heavily treaded of any of the BMX types.