The USA Cycling 24-Hour MTB National Championships return to New Mexico's Zuni Mountains this June to determine the best endurance mountain bikers in America. Held in conjunction with 24 Hours in the Enchanted Forest, riders will be tested on a 19.7-mile course that starts at 7,850 feet above sea level and reaches as high as 8,350 feet of elevation — with 1,800 feet of total climbing — not to mention that it is nearly all singletrack!