Most people seeing the beautiful stone walls of a Western canyon would be content to gaze at the view or snap some photos. But not the fun-loving maniacs in this production, whose natural inclination is to jump, bounce, skid, and careen down the canyon walls on bicycles. Besides some truly spectacular cliff jumps, this tribute to "new school mountain biking" also features segments showing off deliriously reckless riders balancing precariously atop a strange elevated roadway made of logs and boards in the middle of a pine forest, plenty of "dirt jumping," and clips of riders going all out in more conventional downhill mountain bike racing. A few comic interludes, including scenes accurately titled "Nuns with Guns" don't get in the way too much, and this is mostly a beautifully shot and exciting tribute to daredevils pushing their pedals to their limits. --Robert J. McNamara