The sport has the official site www.hardrock100.com . 1891; 128 years ago (1891) is when Chicago Marathon was founded  . London Velopark (BMX, track),Chicago, Illinois, United States were the venues of Chicago Marathon . 18 from 18 nations were the competitors in Chicago Marathon . 28 July – 9 August was when it was held . 16 (from 6 confederations) were the number of teams who competed in Chicago Marathon
22 contenders from 23 nations