Tucson-based Epic Rides, organizer of three mountain bike events in Arizona, welcomes Tucson Medical Center as the Presenting sponsor of the 13th Annual Kona Bikes 24 Hours in the Old Pueblo. Held February 17-19, 2012 at Willow Springs Ranch north of Tucson, the Kona Bikes 24 Hours in the Old Pueblo presented by Tucson Medical Center is one of the largest 24-hour mountain bike events in the world.