Dura Ace Di2 has become renowned as the electronic shifting system to trust. And while it neared perfection, leave it to Shimano to improve upon it even more with the advent of the Dura Ace Di2 9070 11 Speed STI Shifters. First and foremost, you'll notice that the new Di2 features 11 speeds, which is quickly becoming the number to hit. But beyond that, Shimano looked at the aesthetics and ergonomics of the levers to create touch points that enhance your riding experience. The shape of the levers has been given even more of an outward curve while also growing in length. This allows for a better interaction with the levers, whether you're on the hoods or in the drops. Speaking of the hoods, they are made from a dual compound rubber composite with a perforated design, but are now smaller and slimmer in shape. Conversely, the shift paddles have been widened for a better interface in the heat of the moment. Shimano still adds in 10mm of reach adjustment. Beyond the aesthetics is the shifting performance. It is here that Shimano's Rider Tuned philosophy takes shape. For example, with the Di2 9070, you're able to select one of five different rear derailleur shifting speeds. More impressive is that the 9070 is now capable of performing shifts up to 28 teeth on the cassette. To enhance shifting, a more minimal single wire E Tube connection is used. This also makes for more options for the inclusion of satellite shifting systems.