Ключевые слова: abstract, activity, adventure, bicycle, bicycling, bike, biking, black, circle, closeup, colour, concepts, cycle, detail, downhill, edge, equipment, exercise, extreme, fitness, hobbies, isolated, leisure, maintenance, mode, mountain, mtb, new, off, part, profile, racing, repair, riding, road, rubber, safety, spoke, sport, tire, trail, tread, tyre, vehicle, wheel, white,