Shimano Dura-Ace R9170 Di2 Disc Brake 11 Speed Groupset Review

Shimano Dura-Ace R9170 Di2 Disc

Engineered to redefine drivetrain performance, Shimano Dura-Ace R9170 Di2 Disc Brake 11-Speed Groupset is a coveted choice among professional riders, renowned for its unparalleled shifting precision and advanced functionality.

Crafted with meticulous attention to detail, the Dura-Ace R9170 Groupset combines hydraulic disc brake technology and DI2 electronic shifting. So, you can expect to get unrivaled control and responsiveness.

The best thing about this groupset is that every component has been designed to magnify the performance of the entire system.

In this review, we are going to discuss why this groupset is a great choice for riders who seek the best performance.

Key specification of this groupset

Here’s a table describing the key features of the Shimano Dura-Ace R9170 Di2 Disc Brake 11-Speed Groupset:

Key FeaturesDescription
Electronic ShiftingPrecise and efficient electronic shifting for smooth and instantaneous gear changes
Shift/Brake LeversErgonomically designed shift/brake levers for comfortable and responsive control
Front DerailleurFront derailleur with automatic trimming for optimal chain line and minimal chain rub
Rear DerailleurRear derailleur with Shadow RD technology for improved stability and accurate shifting
CassetteWide range cassette options for customizable gear ratios and versatile performance
ChainHigh-quality chain for efficient power transfer and durability
CranksetHollowtech II crankset for increased stiffness and lightweight design
Bottom BracketDurable bottom bracket with improved sealing for smooth and reliable performance
Brake CalipersHydraulic disc brake calipers for consistent and powerful braking performance
Brake TypeHydraulic disc brake system for reliable and responsive braking
Di2 E-Tube TechnologyE-Tube technology for easy customization, firmware updates, and system diagnostics
Wireless ConnectivitySynchronized shifting and wireless connectivity with compatible cycling computers and smartphones
CompatibilityCompatible with other Shimano 11-speed components for easy integration
WeightLightweight design for improved overall bike weight and efficiency
DurabilityHigh-quality construction and materials for long-lasting performance
Recommended UseIdeal for road cycling, offering precise shifting, powerful braking, and high-performance components

Shimano Dura Ace Di2 ST-R9170 STI for Disc Brakes

Now, let’s deep dive into the main features of this amazing groupset:

Perfect Balance for Enhanced Performance

The Dura-Ace R9170 Groupset boasts a perfectly balanced system, optimizing performance by maximizing efficiency.

Every individual component has been improved upon, resulting in a truly superior groupset that delivers exceptional performance on the road.

Synchro Shift Technology

Dura-Ace R9170’s Synchro Shift Technology revolutionizes the shifting experience by intelligently coordinating the front and rear derailleurs.

As you shift between chainrings, this advanced system automatically adjusts the rear derailleur, optimizing gear steps and maintaining your rhythm.

Synchro Shift Technology

With the choice of “Full” or “Semi” Synchro Shift modes, you can customize your shifting preferences. Also, by seamlessly integrating shifting patterns, the Dura-Ace R9170 ensures smooth and precise gear changes.

The simplicity and efficiency of Dura-Ace R9170’s Synchro Shift Technology, allow you to focus on the ride ahead.

Hydraulic Disc Brake Excellence

I have to admit, this groupset sets a new standard for excellence in road cycling.

The reason is the groupset is designed with precision and performance in mind. As a result, this hydraulic disc brake system delivers unparalleled braking power and control.

No doubt, the advanced technology behind it ensures consistent and reliable braking, even in the most demanding conditions. Whether you’re navigating tight corners or descending at high speeds, the Dura-Ace R9170 Hydraulic Disc Brake provides confidence-inspiring stopping power.

With its optimized brake lever shape, stroke, and contact point, you’ll experience enhanced modulation and a responsive braking feel.

Ergonomic Front Derailleur

With its ergonomic shifting operation, this front derailleur ensures smooth and precise gear changes without causing stress or discomfort to the rider.

Its SHIMANO synchronized shift feature enhances shifting performance by automatically adjusting the rear derailleur with each chainring shift. Thus, it maintains the rider’s rhythm and minimizes gear steps.

Ergonomic Front Derailleur

The front shifting is quick and smooth even under high pedaling torque, allowing for seamless transitions between gears.

Wireless Connectivity

A bonus for sure as the Dura-Ace R9170 offers cutting-edge wireless connectivity for enhanced functionality and convenience. With the inclusion of the EW-WU111 wireless transmitter unit, this groupset allows seamless connectivity to iOS and Android devices.

By using Shimano’s free app and the Shimano power meter, cyclists can access a wealth of data and analytics to fine-tune their performance.

This wireless connectivity eliminates the need for cumbersome cables and provides a clean and streamlined setup.

Whether it’s monitoring power output, analyzing ride data, or customizing settings, the Dura-Ace R9170’s wireless connectivity is a bonus help.

Enhanced Shifters

Designed for both mechanical rim brake and hydraulic disc brake systems, these shifters offer a familiar shape with an improved “mechanical-like” feel in the shift button.

Enhanced Shifters

The redesigned layout and increased surface area provide tactile feedback and a satisfying click, ensuring precise and intuitive shifting even in challenging race conditions.

Advanced Crankset Design

Building upon the iconic 4-arm construction, Shimano has optimized the crank arm design to reinforce key stress zones while reducing weight by 7 grams.

The crankset’s HOLLOWGLIDE chainring construction ensures efficient power transfer and accommodates shorter chainstays without compromising performance.

With a range of rider-tuned gear combinations, including options for chainring sizes and crank arm lengths, the Dura-Ace R9170 crankset offers versatility and precision for road cyclists.

Its thoughtful design and attention to detail make it a standout choice for riders seeking top-level performance and reliability.

Real-Life Examples

Imagine navigating challenging descents on a winding mountain road. The Dura-Ace R9170’s hydraulic disc brakes inspire confidence, providing precise modulation and reliable stopping power, even in wet conditions.

The Synchro Shift technology ensures smooth transitions between chainrings, maintaining your momentum and rhythm throughout the ride.

The wireless connectivity allows you to analyze your performance data, giving you valuable insights for training and improvement.


#1. What is the difference between mechanical and Di2 shifting?

Ans: Mechanical shifting relies on cables and levers, while Di2 (Digital Integrated Intelligence) shifting uses electronic signals for precise and reliable gear changes.

#2. Can I use the Dura-Ace R9170 Di2 groupset on a bike with rim brakes?

Ans: Yes, the Dura-Ace R9170 Di2 groupset is available in both mechanical rim brake and hydraulic disc brake versions, offering compatibility for different bike setups.


The Shimano Dura-Ace R9170 Di2 Disc Brake 11-Speed Groupset is a top-tier cycling component that offers unparalleled performance and functionality.

While it may come at a higher price point and require professional installation, it’s cutting-edge technology and precise shifting make it a standout choice for those seeking the pinnacle of drivetrain performance.

Elevate your cycling experience with the Shimano Dura-Ace R9170 Groupset and experience the epitome of excellence on the road.

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