Stock photography, photos: A dusty mountain bike ride Stock photos of A man mountain biking on a dusty Donner Summit, CA. Photograph: © William Stevenson Click for a larger image and more information Keywords associated with this stock photo: biking, mountain biking, bike, cycling, bicycling, back country, active, dirt, dry, dust, dusty, aerobic, momentum, desire, difficult, adventure, freedom, fast, speed, blur, man, male, solo, trail, summer, horizontal, California, sierras, evening, morning, Outdoor, outdoors, outside, sports, sporting, sport, exercise, physical, fitness, outdoorsman, sportsman, adult, young, adventure, adventuring, twenties, 20, s, 30, thirties, one, 1, person, cycle, cycler, adrenalin, excitement, thrill, thrilling, exciting, Waye