Shimano's Dura-Ace ST9170 Di2 Hydraulic Shift/Brake Lever is perfect for riders who seek control and confidence in a race setting. With the Di2 system, we are presented with an intuitive, quick-shifting operation that features customizable functions to fit any rider's style. Its ergonomic cover shape and lever position offer all-day riding comfort and a defined click feeling from stiff dedicated shift panels.