Dirt jumping  From Wikipedia, the free encyclopedia
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Dirt jumping can be done on almost any vehicle with wheels, but
it is usually executed on a dirt jump bike.    • 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" wheels. Strong alloy rims and lightweight chromoly frame.
Suited to bigger jumps or more challe