The Shimano Dura Ace BR-R9170-F is a front hydraulic disc brake caliper designed for road cycling. It is a key part of Shimano’s high-end road groupsets, targeting riders who want reliable, consistent braking for demanding descents, varied weather, and competitive racing. The caliper uses a one-piece forged aluminum body, resulting in a low profile and light weight, which helps keep overall bike weight down for those prioritizing grams—specifically, the front caliper weighs about 131 grams.

The BR-R9170-F is compatible with Shimano’s R9100 series brake levers including the ST-R9180, ST-R9170, and ST-R9120, and is intended for flat mount forks. It uses Shimano’s proprietary mineral oil hydraulic system and is equipped with a ‘one way’ bleeding port for straightforward maintenance. The design features wide pad clearance and chamfered pads for easy wheel changes and reduced risk of rotor drag—helpful for quick wheel swaps during events or training. This caliper is also compatible with Shimano’s ICE TECHNOLOGIES FREEZA brake pads, which help manage heat during prolonged or repeated braking. Installation is simplified with easy tool access and a direct-mount bolt system, making setup and adjustment straightforward for home mechanics or bike shops.