Incredibly light at only 2.46 pounds (1,115 grams), Cannondale's SystemSix frame is comprised of carbon and aluminum tubes and stays that are locked together mechanically. When heated, the carbon expands to lock into "windows" in the aluminum lugs for a tight, extremely strong fit. Plus, the large down tube and fork steerer create unheard of lateral and torsional strength. The resulting ride delivers explosive climbing and sprinting power you'll love.