Shimano Dura Ace - For the highest expectations The Dura Ace is Shimano's lightest, most ergonomic and precise group of components ever. Not only does it offer the finest mechanical performance, it also serves as the chassis for the revolutionary Di2 digital switching system. The extra 11th gear and numerous other improvements make for truly dominant performance. With Dura Ace you win.significant advantages:- 11-speed drive enables precise, race-ready gear changes- newly developed crank set with a 4-arm construction- inner cable system reduces sliding resistance- more effective braking with new SLR-EV braking system technologies:Polymer - Coated CableThe secret is a polymer coating that looks like hoses wrapped around the cable under a microscope. This results in a smaller surface area, which is protected against the inner enclosure...