Desc: Singletrack High: Directed by Isaac Seigel-Boettner, Jacob Seigel-Boettner. At the age of 16, many American kids trade in two wheels for four. Trusty steeds that once gave them freedom to explore on weekends now collect dust in the garage. For a growing number of high school students in Northern California, however, two wheels don't get dusty, they get dirty. Their lives continue to revolve around weekend rides, but now those rides have a finish line. These are the student athletes of the NorCal High School Cycling League. This is Singletrack High.