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

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

£215.00 GBP
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Shimano Ultegra ST-R8170 Left Di2 Lever with BR-R8170 Rear Disc Brake - Pedal Passion
  • Shimano Ultegra ST-R8170 Left Di2 Lever with BR-R8170 Rear Disc Brake - Pedal Passion
Shimano Ultegra ST-R8170 Left Di2 Lever with BR-R8170 Rear Disc Brake

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

£215.00 GBP

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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Key Features & Technical Specifications

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.
Notable Tech, Materials & Construction

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.
Size, Fit, Geometry & Measurements

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.
Who it is best suited for and where it is best suited

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
Product Care & Warranty Info

Product Care

  • Keep brake pads and rotors free from grease, chain lube and cleaning spray.
  • Inspect brake pad thickness regularly.
  • Use Shimano mineral oil only.
  • Replace olives and inserts when shortening or reinstalling brake hoses.
  • Check rotor alignment if brake rub develops.
  • Replace CR1632 lever batteries when required.
  • Keep Di2 firmware updated using Shimano E-Tube.
  • Use a torque wrench when installing levers, calipers and related hardware.
  • Have the hydraulic brake system professionally bled if lever feel becomes soft or inconsistent.
  • Avoid pressure washing directly around Di2 ports, brake calipers and lever internals.

Warranty Information

  • Covered by Shimano manufacturer warranty against defects in materials and workmanship.
  • Warranty generally excludes crash damage, incorrect installation, brake contamination, normal wear, misuse and damage from incompatible components.
  • Professional installation is recommended for safety, performance and warranty protection.
  • Regular inspections and servicing help maintain braking power, Di2 reliability and long-term component performance.
Industry & Rider Feedback. A few Comparison Options

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.

Shimano Dura-Ace ST-R9270 with BR-R9270

  • Lighter than Ultegra
  • Premium Dura-Ace finish and hardware
  • Higher price point
  • Similar overall Di2 shifting and braking feel for most riders

Shimano 105 ST-R7170 with BR-R7170

  • More affordable Shimano 12-speed Di2 option
  • Slightly heavier than Ultegra
  • Excellent for value-focused electronic shifting builds
  • Fewer premium materials and features than Ultegra

SRAM Force AXS HRD Left Lever and Rear Brake

  • Fully wireless electronic shifting platform
  • Different shift logic and brake feel
  • Uses SRAM AXS batteries
  • Strong alternative for riders already on SRAM drivetrains

SRAM Red AXS HRD Left Lever and Rear Brake

  • Premium SRAM option
  • Fully wireless drivetrain system
  • Higher price category
  • Best suited to SRAM Red or Force AXS builds

Campagnolo Super Record Wireless Disc Brake System

  • Premium Italian electronic drivetrain option
  • Distinct ergonomics and braking feel
  • Higher price positioning
  • Less common parts availability in Australia compared with Shimano

Where Shimano Ultegra R8170 Stands Out

  • Excellent value compared with Dura-Ace
  • Fast and reliable Shimano Di2 shifting
  • Strong hydraulic brake modulation
  • Wider pad clearance for quieter braking
  • Clean wireless cockpit design
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