The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates corrosion and stretching and also provides effortless gear shifts add to that the power of hydraulic disc brakes and you have the shimano r785 di2 hydraulic drop bar sti with di2 technology shifting is easy and precise as soft as a mouse click is sufficient for the front or rear derailleur to instantaneously select the correct gear the hydraulic brake lever gives you