State of the art di2 electronic technology for instant accurate shifts first time every time at the push of a button now 11 speed compatible with enhanced feedback and improved ergonomics for easier access to the shift buttons from the top of the hoods cleaner wiring thanks to single wire e tube connections that also make it easy to add satellite shifters for bar tops or in the drop the shimano dura ace 9070 di2 sti shifter set features an efficient design for increased weight saving and