It was held in 28 July – 9 August . London Velopark (BMX, track),Chicago, Illinois, United States were the venues of Chicago Marathon . 16 (from 6 confederations) were the number of teams who competed in Chicago Marathon . The sport has the official site www.hardrock100.com . 18 from 18 nations were the competitors in Chicago Marathon . Chicago Marathon was established on 1891; 128 years ago (1891)
Chicago Marathon saw a competition between 19 squad 