Shimano Ultegra ST-R8170 Left Di2 Lever with BR-R8170 Rear Disc Brake

Name: Shimano Ultegra ST-R8170 Left Di2 Lever with BR-R8170 Rear Disc Brake
Brand: Shimano
Price: 484.99 AUD
Availability: InStock

$484.99 AUD

Taxes included. Shipping calculated at checkout.

The Shimano Ultegra ST-R8170 Left Lever with BR-R8170 Rear Disc Brake delivers premium 12-speed Di2 electronic shifting, powerful hydraulic braking and refined road-bike ergonomics, making it a high-value performance upgrade for riders wanting Dura-Ace-level technology at a more accessible price.

ST-R8170 Features

Shimano Ultegra R8100-series 12-speed Di2 electronic shifting performance
BR-R8170 rear hydraulic disc brake caliper with improved braking modulation
Servo Wave brake technology for better control and smoother lever feel
Wireless Di2 cockpit connection for a cleaner, more aerodynamic front end
10% wider pad clearance to help reduce rotor rub and brake noise

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Technical Specifications

Product Name: Shimano ST-R8170 Left Lever with BR-R8170 Rear Disc Brake
Series: Shimano Ultegra R8100
Lever Model: ST-R8170-L
Brake Caliper Model: BR-R8170
Lever Position: Left-hand lever
Brake Position: Rear brake setup
Shifting Type: Shimano Di2 electronic shifting
Speed: 12-speed
Brake Type: Hydraulic disc brake
Brake Mount: Flat mount
Brake Fluid: Shimano mineral oil
Brake Hose Compatibility: Shimano SM-BH90-JK-SSR
Hose Joint: Straight
Recommended Brake Caliper: Shimano BR-R8170
Brake Technology: Servo Wave Action
Reach Adjust: Yes
Free Stroke Adjust: Yes
Clamp Band Diameter: 23.8–24.2mm
Di2 Connectivity: Wireless and wired Di2 compatible
Firmware Updates: Shimano E-Tube Project compatible
SD300 Port: 1
Satellite Shifter Port: 1 SD300 satellite shifter port
Battery Type: CR1632 lever battery
Claimed Lever Battery Life: Approximately 1.5 to 2 years depending on use
Average Lever Weight: Approximately 391g per pair
Average Caliper Weight: Approximately 123g
Pad Clearance: 10% wider clearance compared with previous-generation Shimano road disc systems
Standard Brake Pad Options: Shimano resin pad options, with finned and non-finned options depending on supplied configuration
Optional Brake Pad Compatibility: Compatible Shimano metal pad options depending on caliper and rotor setup
Compatible Bike Type: Road bikes, endurance road bikes, aero road bikes and race bikes
Recommended Use: Road cycling, endurance riding, fast bunch rides, Gran Fondo events, racing and premium bike upgrades

Compatibility Notes

Designed for Shimano 12-speed Di2 road drivetrains.
Compatible with Shimano Ultegra R8100 and compatible Shimano 12-speed Di2 systems.
Requires compatible Shimano Di2 battery, derailleurs and SD300 wiring where required.
Not compatible with mechanical shifting systems.

Shimano 12-Speed Di2 Electronic Shifting

The ST-R8170 lever is part of Shimano’s modern 12-speed Di2 platform, delivering fast, accurate and consistent electronic shifting without traditional mechanical cable stretch or contamination.

Wireless Cockpit Design

The lever communicates wirelessly with the Di2 system, helping create a cleaner cockpit with fewer visible wires. This improves aesthetics, simplifies front-end routing and suits modern integrated road bike builds.

Servo Wave Hydraulic Braking

Servo Wave technology improves the relationship between lever movement and pad contact. This gives riders quicker initial pad engagement followed by a broader modulation range for more controlled braking.

BR-R8170 Rear Disc Brake Caliper

The BR-R8170 rear caliper provides reliable hydraulic braking performance with improved modulation and quieter operation. It is designed to match Shimano’s latest Ultegra Di2 road platform.

Wider Pad Clearance

The 10% wider pad clearance helps reduce common road disc brake issues such as rotor rub, brake ticking and noise after wheel changes or heat build-up on long descents.

Improved Lever Ergonomics

The revised hood shape includes a raised hood peak and longer support area, helping improve comfort and control during long rides, hard braking and extended time on the hoods.

E-Tube Customisation

Shimano E-Tube compatibility allows riders and mechanics to customise button functions, update firmware and fine-tune Di2 system behaviour.

Lever Fit

Designed for standard road drop handlebars
Clamp band diameter: 23.8–24.2mm
Suitable for compact, traditional and aero road handlebars
Left-hand lever configuration

Adjustment Options

Reach adjustment for different hand sizes
Free stroke adjustment for brake feel tuning
Customisable Di2 button functions
Compatible with Shimano SD300 satellite shifters

Brake Fit

Rear hydraulic disc brake configuration
Flat mount caliper design
Commonly compatible with 140mm or 160mm rear rotor setups depending on frame, adaptor and rider requirements

Fit Recommendation

For best results, installation should include correct lever positioning, brake hose trimming, fresh olive and insert installation, Di2 pairing, caliper alignment and a professional hydraulic brake bleed.

Best Suited For

Road cyclists upgrading to Shimano 12-speed Di2
Ultegra Di2 riders replacing damaged or worn components
Performance-focused endurance riders
Club racers and fast bunch ride cyclists
Riders building a premium road bike
Aero road bike owners wanting cleaner cockpit integration

Cyclists Hub, updated April 2026, praised Shimano Ultegra R8100 Di2 for excellent shifting, braking performance, long battery life and high reliability after more than 5,000km of use. The review noted that Ultegra R8100 offers strong value compared with Dura-Ace, while still providing a premium electronic shifting experience.

Bikerumor, January 2024, published a long-term review of Shimano Ultegra R8100 and highlighted its smooth operation, reliable shifting and strong long-term durability after extended real-world use.

Gravel Cyclist, October 2023, tested Ultegra Di2 12-speed across mixed surfaces and reported smooth shifting, strong braking and reliable performance, even though the system is primarily designed for road use.

Rider Feedback & Community Sentiment

Rider feedback is generally very positive, especially from cyclists upgrading from mechanical shifting or older 11-speed Di2.

Common positive rider comments include:

Fast and accurate shifting
Comfortable hood shape for long rides
Strong hydraulic braking power
Better brake modulation than older Shimano systems
Cleaner cockpit with wireless lever communication
Reduced rotor rub thanks to improved pad clearance
Reliable battery life from CR1632 lever batteries
Excellent value compared with Dura-Ace

Many riders consider Ultegra R8170 one of the best performance-per-dollar electronic road groupset options because it delivers near-flagship performance while keeping replacement parts more affordable than Dura-Ace.

Why We Love It at Pedal Passion

We love the Shimano Ultegra ST-R8170 and BR-R8170 combination because it is a perfect choice road cyclists who want a cleaner cockpit, smoother gear changes and more confident braking without paying full Dura-Ace pricing.