Shimano Rear ST-R8170 Ultegra Di2 Hydraulic Disc Brake - Di2 Shift/Hydraulic Brake 12s

The Di2 platform untethers the shifters while delivering fast and reliable wireless shifting. BR-R8170 disc brake caliper brings a new level of control to the road cycling world with improved modulation and a quicker initial braking point. Despite its smaller construction, the system is quieter than ever and easier to maintain

• The wireless connection provides a clean cockpit, enhancing the aerodynamic effect and easy maintenance
• Wider pad clearance decreases brake noise
• Maintenance-friendly bleeding process
• Unparalelled ergonomic features, such as raised hood peaks on levers
• Brake control is optimized with light and smooth lever action
• Enhanced modulation thanks to an expanded braking control area
• Compatible with wireless or wired connection
• Rotor Included: No (sold separately)
• Pad Compound: Resin
• Brake Caliper Mount: Flat Mount
• Hydraulic Hose Length: 1100mm front; 1700mm rear
• Hydraulic Fluid Type: Mineral Oil
• Brake Lever Actuation: Hydraulic
• Rear Der/Shifter Compatibility: Shimano Road Di2
• Drivetrain Speeds: 12
• Color: Black
• J-Kit Technology: For some frames with internal routing, the J-Kit version may be easier to install, since everything is pre-bled. Disconnected lever comes pre-bled with connecting bolt/built in olive pre-installed. Brake caliper is pre-bled with brake hose connected/capped