The Oak Ass 100 2025 is a premier mountain biking endurance race held annually in Pelham, Alabama, within the expansive Oak Mountain State Park. Oak is the championship event in the year-long National Ultra Endurance (NUE) Series; the event attracts amateur and professional riders seeking to test their limits on one of the Southeast’s most challenging courses. Participants can choose between a 50-mile (one lap) or 100-mile (two laps) course, each meticulously designed to showcase the park’s diverse terrain. The course features significant elevation changes, demanding both physical endurance and technical skill from riders. Riders navigate a mix of singletrack trails, rugged climbs, and fast descents, offering a comprehensive test of mountain biking prowess.
