Shimano Ultegra R8170 Di2 Disc Brake 12 Speed Groupset Review

Shimano Ultegra R8170 Di2 Disc Brake

The Shimano Ultegra R8170 Di2 Disc Brake 12 Speed Groupset is your ticket to unlocking the true joy of road riding.

The redesigned Ultegra ST-R8170 Dual Control Levers redefine ergonomics, providing you with unparalleled control, razor-sharp brake modulation, and the convenience of wireless electronic shifting.

With Shimano’s all-new Di2 platform, you can revel in the fastest and most reliable wireless shifting technology available.

Every precious moment on your bike deserves to be enhanced. Why? We are about to find that out in this detailed review.

Shimano Ultegra R8170 Di2 Disk Brake 12 Speed Groupset Features

Here’s a table showcasing the key features of the Shimano Ultegra R8170 Di2 Disc Brake 12-Speed Groupset:

ComponentModelKey Features
Brake/ShifterST-R8170 L & RDual Control Lever with precise shifting and braking
Front DerailleurFD-R8150Digital precision for fast and seamless front shifting
Rear DerailleurRD-R8150Fast and precise shifting with a single cage length option
Disc Brake CalipersBR-R8170Flat mount design with enhanced modulation and control
CranksetFC-R8100 (optional)Efficient power transfer and multiple crank arm length options
CassetteCS-R8100Seamless 12-speed shifting and wide gear range
ChainCN-M8100Enhanced chain retention and durability
Internal BatteryBT-DN300Long-lasting power source for Di2 system
E-Tube Wires2 x E-Tube WiresConnecting components and transmitting signals
Bottom Bracket (optional)Ultegra Bottom BracketSmooth operation and compatibility (optional)
Disc Rotors (optional)2x RT-MT800Reliable braking performance (optional)
Battery Charger CableEW-FC300Convenient charging cable for the Di2 system

Shimano Ultegra R8170 Di2 Disk Brake 12 Speed Groupset: Features Details

Fast shifting and brilliant brakes, these two are not the only features of this groupset. Let’s look further into the features of this product:

Design and Modulation

Shimano has reimagined the Ultegra ST-R8170 Dual Control Levers, endowing them with all-new ergonomics that elevate your riding experience to unprecedented heights.

Every touch of the brake lever provides a crisp and controlled response, ensuring your safety and instilling confidence in any riding condition.

Shimano Ultegra R8170 Design and Modulation

The meticulously crafted design of the brake system delivers enhanced modulation, allowing you to fine-tune your braking power with ease and precision.

Shifting Performance

The Di2 shifting system on this groupset conquers the challenges inherent in drivetrains, delivering power to your every pedal stroke.

With lightning-fast precision, the Di2 system grants you instant and accurate shifts at the mere touch of a button.

Climbing steep hills or accelerating with gusto becomes effortless as you effortlessly change gears even under heavy loads.

So this Shimano Di2 technology ensures that you are always in complete control of your shifting, allowing you to focus on the road ahead.

Shimano DCL Dual Control Lever

At the heart of the Ultegra R8170 Groupset lies the Shimano DCL Dual Control Lever, a true marvel of engineering. This innovation combines brake and shifting functions, streamlining your operation of the groupset and ensuring effortless control.

Furthermore, The shift internals draw inspiration from Shimano’s rugged mountain bike technology, enabling smooth and seamless shifts with just the touch of a finger.

This integration of shifting and braking showcases Shimano’s commitment to providing a superior riding experience, where performance and innovation converge.

Drivetrain System

This Ultegra R8170 Groupset features an integral component of Shimano’s 12-speed road lineup, the Ultegra R8100 chainset.

With refined design elements, it caters to riders of all sizes and specific biomechanical requirements. Utilizing Shimano’s E-TUBE technology, you can customize your drivetrain to suit your preferences.

Shimano Ultegra R8170 Drivetrain System

Adjust the shift speed, alter the number of shifts per button actuation, and harness the power of synchro and semi-synchro functionality, all to create a personalized riding experience tailored to your needs.

Wireless Cockpit

Seamlessly integrate your groupset with Shimano’s user-friendly E-TUBE App, available on your smartphone or PC. This connectivity empowers you to unlock a realm of customization and interaction.

Connect your Shimano 12-speed wireless drivetrain to compatible partners like Garmin and Wahoo, and enjoy a new level of control and convenience. Imagine effortlessly scrolling through GPS screens using buttons on your shifter, keeping your hands securely on the handlebars.

Thus, Shimano’s all-new Di2 platform, shared by Dura-Ace and Ultegra, revolutionizes wireless shifting, delivering speed and reliability like never before.

Brake System

Despite its compact size, the caliper operates quietly and offers ease of maintenance. Shimano’s Ultegra ST-R8170 brake levers, employing Servo Wave technology, provide enhanced modulation and control, ensuring a smooth and responsive ride.

Developed for mountain bikes, Servo Wave technology delivers quick initial bite followed by controlled force generation for optimal modulation.

Shimano’s this new brake calipers also offer increased pad-to-rotor clearance, reducing the risk of rotor rub even if slight imperfections are present.

Front and Rear Derailleurs

It’s front derailleur performs digitally precise shifts under any circumstances, delivering seamless action with unrivaled speed. Shimano’s new Di2 platform, combined with HyperGlide+ technology, ensures the fastest and most flawless front shifting available.

Moreover, The rear derailleur, available in a single cage length, offers versatile compatibility with various cassette options.

Shimano Ultegra R8170 Front and Rear Derailleurs

With its lightning-fast and accurate shifting, the Ultegra R8150 rear derailleur provides riders with a reliable and efficient option, whether they choose 11-28, 11-30, or 11-34 cassettes.


The FC-R8100 crank of the Ultegra R8170 Groupset maintains the renowned Shimano front shifting and transmission efficiency.

With an extended range of crank arm length options, from 160 to 175mm, the Ultegra crankset caters to riders of all sizes and preferences. Triathletes, smaller riders, and those seeking improved fit or specific biomechanical requirements will find a perfect match.

Speed Chain

The M8100 chain, a vital component of the Ultegra R8170 Groupset, boasts enhanced chain retention, ensuring reliability and durability on any terrain.

With quick-link assembly and SIL-TEC treatment, the chain offers extended off-road durability.

Real life Scenarios

Picture yourself tackling a challenging climb, where the precise and effortless shifting allows you to find the perfect gear, even under heavy load. As you descend, the enhanced modulation of the disc brakes gives you the confidence to navigate tight corners with ease.

Let’s think for a second, effortlessly scrolling through GPS screens on your connected device using the intuitive buttons on your shifter, keeping your focus on the road ahead.


Q. How long should 12 speed Di2 battery last?

A. Shimano Di2’s battery life is indeed impressive, providing riders with approximately 1,000 kilometers (620 miles) of riding on a single charge of the main power source.

Q. Can I mix and match Shimano Di2 components from different series?

A. Generally, Shimano Di2 components are designed to be compatible within the same series, such as Ultegra or Dura-Ace.

Q. Is it possible to customize the button configurations on Shimano Di2 shifters?

A. Yes, one of the advantages of Shimano Di2 is the ability to customize button functions and configurations. Using the Shimano E-Tube Project software or E-Tube Cyclist app, you can assign different functions to the shift buttons based on your preference.

Final Verdict

The Shimano Ultegra R8170 Di2 Disc Brake 12 Speed Groupset shines as a pinnacle of performance, functionality, and innovation.

From the precise and effortless shifting to the exceptional modulation of the brakes, every element of this groupset is meticulously crafted to enhance your cycling experience.

As you conquer the open road or venture off onto gravel trails, the Shimano Ultegra R8170 Di2 Disc Brake 12 Speed Groupset will be your steadfast companion, delivering unparalleled control, reliability, and joy with each revolution of the pedals.

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