Shimano dura ace di2 9070 2x11 speed sti shifterwith di2 technology shifting is easy and precise just a light touch as soft as a mouse click is sufficient for the front or rear derailleur to instantaneously select the correct gear these di2 sti levers are designed so that the shift buttons are placed in nearly identical positions to a mechanical lever for the best feel simply pressing the effortless shift buttons will change gear instantaneously an additional bonus is that the electrical w