Title: BMX
Content: BMX BMX, an abbreviation for bicycle motocross or bike motocross, is a cycle sport performed on BMX bikes, either in competitive BMX racing or freestyle BMX, or else in general on- or off-road recreation. BMX began when young cyclists appropriated motocross tracks for fun, racing and stunts, eventually evolving specialized BMX bikes and competitions. BMX began during the early 1970s in the United States when children began racing their bicycles on dirt tracks in southern California, inspired by the motocross stars of the time. The size and availability of the Schwinn Sting-Ray and other wheelie bikes made them the natural

Title: BMX
Content: to other cycling sports like downhill, including Australian Olympian Jared Graves, Eric Carter and youth BMX racer Aaron Gwin. Multiple world and Olympic champion track sprinter Chris Hoy also began as a BMX rider. BMX BMX, an abbreviation for bicycle motocross or bike motocross, is a cycle sport performed on BMX bikes, either in competitive BMX racing or freestyle BMX, or else in general on- or off-road recreation. BMX began when young cyclists appropriated motocross tracks for fun, racing and stunts, eventually evolving specialized BMX bikes and competitions. BMX began during the early 1970s in the United States when children

Title: Mountain bike
Content: individuals on mild to moderate cross country terrain. Mountain cross or "Four-cross" (4X) is a type of racing in which four bikers race downhill on a prepared, BMX style track. These bikes generally fall under the categories of Dirt Jump or Slopestyle designs, with the main distinctions being the use of a derailleur rather than a single speed setup, or slightly slacker head angles than ordinary Dirt Jump bikes for increased stability at race speeds. Four-Cross racing has fallen in popularity recently, with the UCI removing Four-Cross from the World Cup due to excessive erosion and inconvenience caused by the

Title: Four-cross
Content: used in BMX. Four-cross was added to the UCI Mountain Bike World Cup and the UCI Mountain Bike & Trials World Championships in 2002, replacing dual slalom. It was removed from the World Cup following the 2011 series. A replacement world series, the 4X Pro Tour, was launched in 2012. As of 2018, the current UCI men's four-cross world champion is Quentin Derbier while the women's world champion is Romana Labounková. Four-cross Four-cross (4X), also called mountain-cross, not to be confused with fourcross, is a relatively new style of mountain bike racing where four bikers race downhill on a prepared,

Title: Four-cross
Content: Four-cross Four-cross (4X), also called mountain-cross, not to be confused with fourcross, is a relatively new style of mountain 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 3 to 4 inches of travel, or hardtails, 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

Question: In cross-country bike racing, what do the initials BMX represent?
Answer: Bicycle moto x (cross)