The Dura Ace name is so consistently synonymous with success, it needs no introduction. If you're thinking of upgrading to Dura Ace there's no doubt that you know what you're shooting for—the absolute best. From the bike path to the pro peloton Dura Ace sets the pace for the rest of the pack. With the introduction of Di2, Dura-Ace changed the face of performance cycling once again. The Shimano Dura-Ace ST-9070 Shifter set utilizes state of the art Di2 electronic technology for instant, accurate shifts every time, at the push of a button. Dura-Ace Di2 is now 11-speed compatible, with enhanced feedback and improved ergonomics for easier access to the shift buttons from the top of the the hoods. Improved wiring is thanks to single-wire E-tube connections, that also make it easy to add satellite shifters for bar tops or in the drops, all while maintain clean wiring lines. Smooth, effortless shifting. No compromise performance. Dura-Ace is the pinnacle of cycling performance.