Ключевые слова: abstract, activity, aluminum, bicycle, brake, cable, chain, change, chrome, closeup, color, construction, cycling, derailleur, dirty, engineer, equipment, exercise, fitness, frame, freewheel, gear, health, industry, isolated, land, machine, machinery, macro, metal, mountain, part, pedal, race, shiny, speed, spoke, sport, steel, summer, technology, teeth, tire, transportation, vehicle, wheel, wrench,