Brian Thomas Lopes (born September 6, 1971, in Mission Viejo, California) is a professional mountain bike racer who specializes in four-cross.
Cross-country (XC) cycling is a discipline of mountain biking.
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.
Mountain bike racing (shortened MTB or ATB racing) is the competitive cycle sport discipline of mountain biking held on off-road terrain.
The Union Cycliste Internationale (UCI;, International Cycling Union) is the world governing body for sports cycling and oversees international competitive cycling events.