No American has medaled in the men's two-person bobsled since 1952 or won gold since 1936. So after the 2010 games, the U.S. team recruited engineers from BMW to completely overhaul its sled. They replaced the typical fiberglass body with one made of carbon fiber similar to the material developed for the new BMW i3. That freed up about 15 pounds, which the engineers redistributed to lower the sled's center of gravity, making it faster.
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