The cream of the crop; the Kestrel 4000 LTD Dura-Ace Di2 triathlon bike is as fast as it is gorgeous. All of the stops were pulled out in order to put together a bike for any rider unwilling to compromise on quality and full-on miles per hour. Shimano Di2, Oval deep dish carbon wheels and Kestrel's proprietary carbon technology combine to make more of a rocket ship than a bike.