The DURA-ACE Di2 ST-R9170 brings both Shimano's praised hydraulic disc brake technology and the category-leading DI2 electronic shifting in a package ready for the most demanding of race situations. An updated button feel and layout ensure precise shifting while enhanced ergonomics guarantee comfort, allowing you to concentrate on the effort at hand.
• More control and confidence in race condition with updated brake lever shape, while more intuitive, quicker shifting operation with more defined click feeling
• Customizable function to fit any riding style with E-Tube project
• Optimum power transmitted with firm grip and ideal ergonomic cover shape
• Electronic shift
• Hydraulic disc brake
• Mineral oil
• Consistent braking performance in all weather conditions
• Reach adjustment range (10.9 mm)
• Clamp band diameter – 23.8-24.2 mm
• Recommended brake caliper (not included): BR-R9170
• Recommended brake hose kit (not included): SM-BH90-JK-SSR