Downhill (DH) a cyclist commonly travels to the point of descent by other means than cycling, such as a ski lift or automobile. Downhill Trails designated in this site are Downhill Only. Because of their extremely steep terrain, downhill courses are one of the most extreme and dangerous venues for mountain biking. Difficulty designations vary by area and are not interchangeable between regions. You must ride the local trail to establish knowledge about what a beginner, intermediate, and difficult trail means in the Tetons.