Ключевые слова: abstract, activity, athlete, background, bicycle, bike, biking, chain, competition, competitive, crank, cycle, drive, exercise, extreme, fun, geometric, healthy, hobby, illustration, isolate, lifestyle, motion, pattern, pedal, pursuit, race, recreational, ride, riding, safety, silhouette, simmetry, speed, spoke, sport, stamp, style, stylish, tour, track, training, transport, transportation, travel, vehicle, velocity, wheel,