Shimano Dura Ace BR-R9170

This specific version of the BR-R9170 caliper is designed to accommodate frames with thicker chainstays, specifically those measuring 30mm. It includes the necessary hardware to ensure the caliper mounts securely and aligns perfectly with the rotor on these wider frame sections.

The BR-R9170 is part of the Dura-Ace R9100 series. While it is designed for this specific ecosystem, it is generally compatible with other Shimano hydraulic road levers that use the same fluid and hose standards, though you should always verify your specific lever model's compatibility.

Yes, this hydraulic system requires Shimano's mineral oil. Do not use DOT fluid, as it will damage the seals and internal components of the braking system.

The flat-mount standard allows the caliper to sit closer to the frame, resulting in a cleaner, more integrated aesthetic. Beyond the look, it provides a more rigid mounting interface, which helps reduce vibration and improves overall braking consistency.

If you are comfortable with hydraulic systems, bleeding brakes, and torque specifications, you can perform the installation. However, because this involves your bike's primary safety system, we recommend having a professional mechanic handle the setup to ensure proper alignment and a bubble-free bleed.