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Four-cross (4X), also calledmountain-cross, not to be confused withfourcross, is a relatively new style ofmountain bike racing where four bikers race downhill on a prepared,BMX-like track, simply trying to get down first. These bikes are generally either full suspension with 140mm to 160mm of travel, orhardtails, and typically have relatively strong frames. They run a chainguide on front and gears on the back. They have slack head angles, short chainstays and low bottom brackets for good cornering and acceleration. In recent years the tracks raced on have been rougher and less like those used in BMX.
Four-cross was added to theUCI Mountain Bike World Cup and theUCI Mountain Bike & Trials World Championships in 2002, replacingdual slalom. It was removed from the World Cup following the 2011 series. A replacement world series, the 4X Pro Tour, was launched in 2012. The four-cross events were removed from the World Championship after the 2021 edition.
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