Ключевые слова: abstract, action, activity, aluminum, bicycle, bicycle chain, bicycle component, bicycling, bike, bike gear, biking, black, cassette, chain, closeup, cycle, derailleur, downhill, equipment, exercise, extreme, fitness, frame, freewheel, gear, gearing, gearshift, gearwheel, hobbies, hub, isolated, isolated gear, leisure, messy, metal, mountain, new, part, racing, recreational sport, repairing, riding, speed, spoke, sport, sprocket, technology, transport, travel, wheel,