Shimano Ultegra Di2 Left Shift Brake Lever ST-R8170 - BR-R8170 IR8170DLF6SC100F

Shimano ULTEGRA Di2 ST-R8170 + BR-R8170 2x12-Speed ​​Hydraulic Disc Brake (Front Set)
Wireless Speed, Maximum Control, Flawless Braking Power.

The new Shimano ULTEGRA Di2 ST-R8170 + BR-R8170 front brake set takes Shimano's legendary "Science of Speed" philosophy a step further. Improved ergonomics, wireless electronic shifting , SERVO WAVE brake technology, and an optimized hydraulic system set a new standard in both gear and brake performance for road bikes.

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⚙️ Superior Control and Precision

In developing the new ULTEGRA R8150 Di2 groupset, Shimano engineers perfected not only speed but also the balance between control and comfort .
The new ST-R8170 Dual Control levers offer aerodynamic and ergonomic advantages with their more rounded brake grips, while the wireless communication protocol ensures zero delay and maximum precision with every gear change.

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🧩 Technical Excellence

The BR-R8170 two-piston flat-mount caliper is fitted with resin pads with L03A cooling fins .
This design improves heat dissipation, increases braking power , and minimizes friction.
Result: A quieter, more powerful, and more maintenance-friendly braking experience.

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🔧 Key Features

• Wireless Di2 technology: Fastest data transfer with the lowest energy consumption.

• SERVO WAVE braking system: Maximum braking power with minimum lever movement.

• Precise brake modulation: Advanced control and heat management.

• E-TUBE compatibility: Customizable gear speeds and button functions via the app.

• Ergonomic Dual Control handle: Better grip, more natural control.

• Easy maintenance: One-way air bleeding system, clean assembly and practical wheel replacement.

• Long battery life: 1.5–2 years of use with the CR1632 battery.

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⚙️ Technical Specifications

• Area of ​​Use: Road

• Group: Ultegra Di2 R8150

• Model: ST-R8170-L + BR-R8170

• Gear: 2x12-speed (front left lever)

• Installation: Handlebar diameter 23.8–24.2 mm

• Brake Type: Hydraulic disc (Flat-Mount)

• Caliper: BR-R8170 (2-piston)

• Brake pad: L03A Resin (with cooling fins)

• Brake Hose: SM-BH90-JK-SSR, 1000 mm (oil-filled and shortenable)

• Hydraulic Oil: Shimano Mineral Oil

• Rotor Compatibility: RT-MT800 140 mm / 160 mm (not included)

• E-TUBE Compatibility: EW-SD300

• E-TUBE Ports: 2

• Wireless Di2 Chip: Built-in

• Battery: CR1632 x 1

• Arm Adjustment: Reach adjustment available.

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🧱 Material Quality

• Body: CFRP composite

• Control lever: Carbon (painted)

• Caliper: Aluminum

• Color: Series color (Ultegra gray tone)

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📦 Box Contents

• 1 x Shimano Ultegra Di2 ST-R8170 Left Lever (2x gears)

• 1 x Shimano Ultegra BR-R8170 Front Caliper (Flat-Mount)

• 1 x Flat-Mount Adapter (140/160 mm)

• 1 x L03A Resin Brake Pad (with cooling fins)

• 1 x SM-BH90-JK-SSR Brake Hose (1000 mm, oil-filled)

• 2 x Caliper Mounting Screws

• 1 x Tube Joint Kit

• 1 x CR1632 Battery

Note: Rotor (RT-MT800) is not included in the box.

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💡 Shimano Technologies

🔹 SEIS – Shimano Electronic Intelligent System

Electronic gear shifting systems use digital signals instead of mechanical cables .
Thanks to this system, gear changes are possible:

• Faster ,

• More sensitive ,

• It happens smoothly under all circumstances.
  Cold, rain, or fatigue no longer affect gear shifting.

🔹 E-TUBE Platform

It is an intelligent system that connects all Di2 components.
Via the app:

• You can adjust the gear speeds,

• You can choose between full or semi-synchronous mode.

• You can change the functions of the buttons on the controllers.

🔹 SERVO WAVE Technology

It optimizes brake lever movement.
More powerful braking with less arm movement,
It provides a wider modulation range and more precise control .

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🏁 Shimano “Science of Speed” Philosophy

The new ULTEGRA Di2 series delivers seamless integration, reliability, and performance at race speed.
Every detail is designed to create advantages measured in seconds.

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Manufacturer Code: IR8170DLF6SC100F
EAN: 4550170241056
UPC: 192790241050

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Shimano ULTEGRA Di2 ST-R8170 + BR-R8170 2x12-Speed ​​Front Hydraulic Disc Brake Set —
Wireless Sensitivity, Exceptional Power, Legendary Shimano Feel. 🚴‍♂️💨