Ключевые слова: abstract, apparatus, arrangement, bicycle, bicyclepartsselectivefocuscloseup, bike, chain, circle, close, closeup, concept, cycle, design, development, energy, engineering, equipment, focus, frame, gear, gearshift, gearwheels, grease, idea, industrial, industry, iron, life, machine, machinery, macro, mechanics, metal, metallic, mountain, oil, part, power, selective, speed, spoke, sport, steel, technology, transmission, transport, up, vehicle, wheel,