America's top endurance mountain bikers will head to the Zuni Mountains of New Mexico this summer to vie for Stars-and-Stripes jerseys at the 2013 USA Cycling 24-Hour Mountain Bike National Championships. Held in conjunction with 24 Hours in the Enchanted Forest, riders will be tested on a 16-mile course that is nearly all singletrack, starts at 7,850 feet above sea level, and reaches as high as 8,350 feet of elevation — with 1,344 feet of climbing.