The high elevation and thin air of Colorado’s Thunder Valley creates challenges that both racers and mechanics must overcome. For a rider, the lack of air is brutal on their bodies, as their lungs gasp for the necessary oxygen for their burning muscles. Then there is the bike, which is down roughly 15-percent of its normal power, and that forces the pilot to work even harder to stay up to speed. Thanks to the advances of fuel injection, mechanics have a much easier task at perfecting the bike, but additional measures are necessary. We spoke with a number racers and tuners on what they must do to prepare for Colorado, as well as Paul Lindsey and John Tomac on the advantages of living in a higher altitude.