Ключевые слова: acrobatics, action, adventure, air, athlete, bicycle, bicyclist, bike, biker, biking, bmx, boy, cycle, cyclist, danger, dangerous, dirt, dirtjump, extremal, extreme, fall, freestyle, guy, hazard, helmet, jump, lifestyle, man, one, outline, people, person, rider, riding, risk, risky, silhouette, sky, sport, stunt, style, transport cologique, transportation, trick, up, urban, vehicle, wheel, young,