Race tech: Bikes of the USA Pro Challenge

The world's top pros take to the high mountains of Colorado

This article first appeared on BikeRadar.com.

The USA Pro Cycling 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.

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