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A compact drivetrain refers to cranksets with a smaller bolt circle diameter then the standard 130mm found on 53/39T cranksets. The compact crankset provides a perfect gearing option with 50/34T chainrings that allows the rider to climb with greater ease without compromising performance on the flats and descents. In the 2010 Giro de Italia, the use of compact cranksets allowed racers to conquer climbs that were not thought rideable including the Monte Zoncolan, rising 4,000 vertical feet in just over 6 miles.