12 (from 4 confederations) teams participated in Hardrock Hundred Mile Endurance Run . 16 from 8 nations competed in Hardrock Hundred Mile Endurance Run . late October or early November was when it was held . 1977 is when Hardrock Hundred Mile Endurance Run was established  . The sport has the official site chicagomarathon.com . The venue for Hardrock Hundred Mile Endurance Run was Stade Roland Garros (since 1928) . The no. of events in sport was 6
12 teams competed against each other in Hardrock Hundred Mile Endurance Run