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, and will generally run only a rear v-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 for a smoother landing if the jump is not done properly and are also easier to hold for in-flight tricks; However some riders do not find seat size an issue. The gear ratio is generally around 44:16, 36:13, 33:12, 30:11 or 25:9 though using small gearings such as 25:9, known as 'micro gearing', has become popular.
Hybrid BMX/Jump bike - a scaled-up BMX with 24-inch wheels. Strong alloy rims and lightweight chromoly frame. Suited to bigger jumps or more challenging competition courses.