With smaller sleeker hoods the 11 speed compatible st 9001 sti units deliver improved ergonomics for better rider comfort and control with reduced lever stroke and lighter action the shimano dura ace 9001 sti 11 speed sti shifter set provide better controllability for multiple riding styles smaller volume hood better control from the hood position they also create a powerful and controllable braking system for added safety polymer coated cables for the smoothest shifting shifting effort