Photo of the Day: Spencer’s Speed Run at Castaic on the Pinarello

Mountain Bike Action test rider Spencer Rathkamp blazes the downhill during last Thursday’s Over the Hump race in Castaic, California, on the wild, carbon fiber Pinarello DogmaXC. A skilled dirt-jumper as a kid, Spencer is proving to be a talented cross-country racer, too. Photo: JK/Mountain Bike Action

The DogmaXC’s frame uses Pinarello’s ultra-unique ONDA XC Twin Arms seat stays and asymmetric chain stays.

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