Shimano | Ultegra Di2 R8170

Shimano Ultegra R8170 Di2 Groupset

TheShimano Ultegra R8170groupset brings fast electronic shifting, hydraulic disc braking and race-focused ergonomics to performance road bikes. Its 2×12-speed Di2 drivetrain delivers precise gear changes, while the semi-wireless layout creates a clean and modern cockpit.

Shimano developed this groupset for competitive riders, sportive cyclists and demanding enthusiasts. It combines technology derived from Dura-Ace with practical durability and a more accessible price point.

Shimano Ultegra R8170 Shifting Performance

The Di2 electronic drivetrain delivers quick, smooth and consistent shifts. It responds immediately when the rider presses a shift button, even during hard accelerations or sustained pedalling efforts.

The Hyperglide+ cassette design also supports smooth gear changes under load. Therefore, riders can maintain their rhythm during climbs, sprints and frequent changes of pace.

The rear derailleur supports compatible 12-speed cassette options with a largest sprocket between 28 and 34 teeth. This provides suitable gearing for fast racing, rolling routes and steep climbs.

Semi-Wireless Di2 Design

The shift and brake levers communicate wirelessly with the rear derailleur. Meanwhile, cables connect the front and rear derailleurs to a central rechargeable battery.

This semi-wireless configuration reduces cockpit clutter and simplifies the appearance of the bicycle. It also maintains a reliable connection between the main drivetrain components.

The rear derailleur acts as the central communication point for the system. It also provides charging access and communicates with compatible devices.

Hydraulic Disc Brake Control

The hydraulic disc brakes provide strong stopping power and smooth modulation. Shimano’s Servo Wave technology moves the brake pads quickly toward the rotor before increasing control through the remainder of the lever stroke.

As a result, riders can brake confidently on technical descents, sharp corners and wet roads. The system also increases pad clearance, which helps reduce unwanted brake noise.

The refined lever shape supports a secure and comfortable hand position. Consequently, riders can maintain effective control from both the hoods and the drops.

E-Tube Project Customisation

The Shimano E-Tube Project app allows riders to customise several Di2 functions. You can assign different actions to the shift buttons, select shifting modes and adjust system preferences.

The app also allows you to check battery information and install compatible firmware updates. In addition, the system can communicate with supported cycling computers through Bluetooth and ANT+ connections.

Optional satellite shifters can add extra shift buttons to suitable handlebar positions. This feature benefits riders who want additional control during climbing, sprinting or aerodynamic riding.

Lightweight Road Performance

Ultegra components use lightweight aluminium and composite materials to balance stiffness, durability and low weight. The Hollowtech II crank construction supports efficient power transfer during high-intensity riding.

The drivetrain offers a responsive feel during acceleration and sustained efforts. At the same time, its broad gear range makes it suitable for long-distance riding and varied terrain.

This combination makes the groupset a strong choice for cyclists who want race-level electronic performance without moving to the premium Dura-Ace range.

Key Features

2×12-Speed Di2 Drivetrain:Provides fast, accurate and consistent electronic shifting.

Semi-Wireless Controls:Wireless shift levers create a cleaner cockpit.

Hydraulic Disc Brakes:Deliver powerful braking and controlled modulation.

Servo Wave Technology:Provides quicker initial pad contact and precise lever control.

Hyperglide+ Cassette:Supports smooth shifting during demanding pedalling efforts.

E-Tube App Compatibility:Allows control customisation, battery monitoring and firmware updates.

Bluetooth and ANT+ Connectivity:Communicates with compatible devices and cycling computers.

Satellite Shifter Compatibility:Supports optional sprint or climbing shift buttons.

Product Specifications

Brand:Shimano
Series:Ultegra
Model:R8170 / R8100 series
Drivetrain:Electronic Di2
Number of Speeds:2×12
Brake Type:Hydraulic disc brake
Shift Lever Connection:Wireless
Derailleur Connection:Wired to central battery
Rear Derailleur:RD-R8150
Compatible Largest Sprocket:28–34T
Cassette Technology:Hyperglide+
Crank Technology:Hollowtech II
App Compatibility:Shimano E-Tube Project
Wireless Communication:Bluetooth and ANT+
Intended Use:Performance road cycling

TheShimano Ultegra R8170combines rapid Di2 shifting, precise hydraulic braking and customisable electronic controls. It offers a refined balance of speed, reliability and value for racing, sportives and high-performance road riding.

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For official specifications and compatibility information, visit theShimano product page