No politics here...it's just plain cool when the president of the United States rides a mountain bike. Apparently the president began mountain biking after he started having trouble with his knees from running. He was looking for a cardiovascular sport that could be done outside without impacting his knees. An Associated Press article gave a few details about the bike the president rides. He rides a carbon fiber Trek Fuel 98 worth $3,100. Ironically, the president rides with clips on his pedals and has yet to "go clipless."