Shimano ultegra di2 6870 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 the 6870 shifter offers improved ergonomics this combined with the easy shifting levers mean less effort per shift the removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates corrosion and stretching