Shimano Dura Ace WH 9000 C24 CL Road Wheelset. Shimano has redefined excellence in carbon fiber road wheels with their superb WH 9000 C24 CL edition. This flagship set of road wheels provides a perfect marriage between carbon fiber and aluminum with the structural elements of the rim created out of carbon fiber for stiffness and reduced rotational mass while the aluminum brake track delivers superb stopping power. The rim is wider 20.8mm than previous Dura Ace editions for more stability during cornering while its low profile height 21mm front23mm rear means it's stiff, spins up quickly, and handles well in crosswinds. The 16 spoke front wheel features radial lacing while the 20 spoke rear wheel utilizes a 2x pattern for increased strength. Both wheels, however, have bladed spokes for optimal aerodynamics. The rear wheel is 11 speed compatible and includes a titanium freehub body to keep the weight to a minimum. These wheels are incredibly versatile and perfectly suited for training, racing, or just spirited riding on a daily basis. These wheels were tested under race conditions by Team Sky during the Tour de France and Sky's recent record in La Grande Boucle certainly attests to their capacity to excel under the most demanding situations. So if you're looking for the optimal set of wheels for your upgrade, you've found your set.