SHIMANO ST-R8170 (ULTEGRA) | 12-speed Di2 Hydraulic STI Lever with Evolved Operability and Braking Power

Instantaneous Confidence in Your Grip. Next-Generation ULTEGRA Di2 Control Performance.

The "ST-R8170" from the SHIMANO ULTEGRA R8100 series is a dual control lever for hydraulic disc brakes compatible with 2x12-speed Di2 systems.

Wireless connectivity provides a clean cockpit area, improving aerodynamics and maintainability. While maintaining shifting performance, it achieves a more refined road bike system.

Furthermore, based on feedback from professional riders, the bracket shape and lever position have been revised, significantly improving grip comfort and control performance. Brake lever stroke and modulation performance have also been optimized, providing a high level of confidence during high-speed riding and technical descents.

Inheriting the latest technology from DURA-ACE, this high-performance Di2 STI lever is suitable for a wide range of uses, from racing to long-distance rides.

Features

• 12-speed Di2 dual control lever from the ULTEGRA R8100 series
• Hydraulic disc brake compatible model
• Clean cockpit achieved through wireless connection
• New ergonomic design reflecting feedback from professional riders
• Upward-extending bracket shape improves comfort in aero position
• Light and smooth lever operation
• Improved brake modulation performance
• Features Servo Wave mechanism
• Supports both wired and wireless Di2 connections
• Supports satellite shifter connection
• Long battery life of approximately 1.5 to 2 years with CR1632 battery

SPEC

• Series: ULTEGRA R8100
• Model: ST-R8170
• Compatible speeds: 2x12 speed
• Shifter type: Dual Control Lever
• Compatible brakes: Hydraulic disc brakes
• Recommended caliper: BR-R8170
• Compatible hose: SM-BH90-JK-SSR
• Hose joint: Straight
• Oil: Shimano Mineral Oil
• Reach adjust mechanism: Included
• Free stroke adjustment: Supported
• Servo Wave: Included
• SD300 port: 1
• SD300 satellite shifter port: 1
• Battery: CR1632
• Average weight: Approx. 391g (pair)

What is particularly noticeable in terms of evolution with the R8100 generation is the grip comfort and brake control of the ST-R8170.

The bracket shape feels very natural, giving the impression that your hands will not tire easily even during long rides. The brakes are also easy to control from the moment you grip them, providing a sense of security even on descents or in wet weather.

The shifting response of Di2 is, of course, excellent, and the feeling of precise shifting the moment you press the lever is something you won't want to give up once you've experienced it.

This latest generation ULTEGRA STI lever is recommended not only for race-oriented riders but also for long-distance riders who prioritize comfort and operability.