Stock photography, photos: Two dusty mountain bikers Stock photos of Two woman walking their bikes and dogs up a hill while mountain biking on 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, single, track, training, back country, action, active, effort, energy, liveliness, endurance, motivation, strength, strong, power, challenge, desire, difficult, adventure, dust, dusty, woman, female, solo, self, reliance, summer, California, sierras, white, backlight, backlit, horizontal, helmet, dog, Outdoor, outdoors, outside, sports, sporting, sport, exercise, physical, fitness, outdoorsman, sportsman, adult, young, adventure, adventuring, twenties, 20s, 30s, thirties, 2, two, people, Somm Lanc