What Is It?
The Shimano Ultegra ST-R8170 Left Lever is a premium 12-speed Di2 hydraulic dual control lever designed for modern road bikes equipped with Shimano's wireless Ultegra R8100 Di2 groupset. The left-hand lever operates the front derailleur electronically (on 2x drivetrains) while also controlling the hydraulic front disc brake, delivering fast, precise shifting and powerful braking.
Featuring Shimano's latest ergonomic hood design and refined lever shape, the ST-R8170 provides improved comfort, enhanced control, and effortless braking from both the hoods and drops. It communicates wirelessly with the rear derailleur while maintaining wired connections within the cockpit for reliable performance.
Key Benefits
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12-Speed Di2 Electronic Shifting: Fast, precise, and consistent front shifting.
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Hydraulic Disc Braking: Excellent braking power with smooth modulation.
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Improved Ergonomics: Redesigned hood shape enhances comfort and hand support.
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Wireless Di2 Platform: Communicates wirelessly with the rear derailleur while simplifying cockpit setup.
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Servo Wave Brake Action: Delivers quicker brake engagement with excellent modulation.
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Customisable Shifting: Compatible with Shimano E-TUBE PROJECT for personalised button functions.
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Lightweight Performance: Designed for racing, endurance riding, and high-performance road cycling.
Specifications
| Specification |
Details |
| Product |
Shimano Ultegra ST-R8170 Left Dual Control Lever |
| Series |
Ultegra R8100 |
| Model |
ST-R8170-L |
| Speed |
12-Speed Di2 |
| Side |
Left |
| Brake Type |
Hydraulic Disc Brake |
| Shift Type |
Electronic Di2 |
| Front Shifting |
2-Speed (Front Derailleur) |
| Reach Adjustment |
Yes |
| Servo Wave |
Yes |
| Recommended Brake Caliper |
BR-R8170 |
| Hydraulic Fluid |
Shimano Mineral Oil |
| Colour |
Series Black |
| Approximate Weight |
391 g (lever only) |
Compatible Components
The Shimano Ultegra ST-R8170 Left Lever is compatible with:
- Shimano Ultegra FD-R8150 Di2 Front Derailleur
- Shimano Ultegra RD-R8150 Di2 Rear Derailleur
- Shimano Ultegra BR-R8170 Hydraulic Brake Caliper
- Shimano Dura-Ace R9200 Di2 12-speed components
- Shimano CN-M8100 / CN-M9100 / CN-M8100 HG+ 12-speed chains
- Shimano RT-CL800 and RT-MT800 Centre Lock rotors
- Shimano SM-BH90 hydraulic brake hose
- Shimano E-TUBE PROJECT app
Who Is This Best Suited For?
The Shimano Ultegra ST-R8170 Left Lever is ideal for:
- Road cyclists
- Endurance riders
- Competitive racers
- Gran Fondo participants
- Performance enthusiasts
- Riders upgrading to Shimano 12-speed Di2
- Cyclists seeking premium electronic shifting and hydraulic braking
