Shimano 105 R7170 Di2 12s GroupsetDi2s SHIMANO 105 DEBUT The new SHIMANO 105 brings Di2 shifting to a new set of riders. For those who have only experienced mechanical shifting and ergonomics, SHIMANO 105 Di2 represents a transformation of the road cycling experience. With function and technologies inherited from DURA ACE and ULTEGRA, SHIMANO 105 is the culmination of years of research and development. With a shared Di2 platform, sophisticated ergonomics, SHIMANO 105 optimized gear