This Fee Event is a climbing endurance challenge. It's part of the coveted Triple Crown (Huntsman 140, Iron Lung, and Lotoja in the same year). Iron Lung offers riders 100, 80, and 34 mile options in multiple categories. The 100 mile course can be raced individually or as a 2-person 6-leg relay. For more information see this link: https://ironlungride.com/