Ключевые слова: alloy, aluminum, background, bicycles, bikes, cassettes, chainrings, chains, chrome, circles, clean, close, closeup, cogs, cogwheel, dent, detail, freewheel, gearing, gears, gearwheel, grease, grey, iron, isolated, machine, machinery, macro, mechanism, metal, metallic, mountain, parts, piece, repair, ride, rings, shifting, shiny, silver, sparkling, speed, sprockets, steel, technology, teeth, tooth, toothed, wheels, white,