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1 definition by Chris 4X Roberts

 
1.
4x
Mountain Bike Race with four riders racing is knock out format.
Four riders will race each other down short manmade course with jumps, berms, stepdowns.
4X racing takes place all over the world.
Britain has the largest series in Europe check out www.nps4x.com
by Chris 4X Roberts April 22, 2007
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