Gallery: The bikes of the USA Pro Challenge

The machines raced by the world's top pros race in the high mountains of Colorado

The USA Pro Challenge is one of the last stops on the calendar for the 2012 road season with the towering mountains of Colorado putting many of the riders higher above sea level than they've ever been outside of an airplane. Here's a look at what some of the riders are using as they make their way to the state capitol of Denver.

Check out the gallery at right for 90 images of bikes and gear from the race.

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