Shimano Ultegra ST-R8170 Di2 Hydraulic Levers

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Shimano Ultegra ST-R8170 Di2 Hydraulic Levers


The ST-R8170 electronic shift/brake lever from Shimano's Ultegra Di2 road bike groupset shifts 12-speed or 2-speed wirelessly and brakes hydraulically. It is powered by a CR1632 button cell, which lasts at least 1.5 years and which you can replace on your own. ST-R8170 communicates via wireless protocol with the rear derailleur, which in turn is wired to the battery and indirectly to the front derailleur. Not only do you benefit from lightning-fast gear shifting and a tidy cockpit, but installation is also much easier without cables. Alternatively, you can also use the Dual Control lever wired. The ergonomics have been further optimized compared to previous models, and allow for a very comfortable grip. It is also possible to communicate wirelessly with a third-party device via special keys. In terms of braking performance, this Ultegra STI goes one step further than before: thanks to Servo Wave technology, the full braking power is available to you more quickly, but it can also be better dosed at the same time. In addition to the grip width, you can also adjust the empty travel, both using a 2 mm hex tool. With the help of the completely revised funnel (not included), even the bleed process is no problem. The brake lever of the ST-R8170 is made of lightweight aluminum, while the grip body is made of carbon, which saves additional weight.


Series: Ultegra Di2 R8170
Application: Road
Gearing: 2-speed, 12-speed
Shifting System: electronic, semi-wireless
Brake Type: hydraulic

Note: Left and Right Lever Only - Hoses are not Included

Technical Information:

Brake Lever Material: aluminum
Lever Body Material: carbon (CFRP)
Hose: SM-BH90-JK-SSR (not included)
Actuation: mineral oil
Mount: clamp (closed)
Reach Adjust: bolt
Adjustment Options: reach adjust, contact point


Clamp Diameter: 23.8 - 24.2 mm
Power cable: EW-SD300-I (1 x connection)
Rear Derailleur: RD-R8150, RD-R9250
Front Derailleur: FD-R8150, FD-R9250
Crankset: FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-P
Cassette: CS-R8100-12, CS-R9200-12
Chain: CN-M8100, CN-M9100, CN-M7100, CN-M6100
Recommended Brake Caliper: BR-8170 
Additional Brake Lever: BL-RX812
Satellite Shifter: SW-RS801-S, SW-RS801-T (1 x connection via EW-SD300)


- tidy cockpit, aesthetic look thanks to wireless connection
- wireless shifting, precise and fast (rear derailleur / front derailleur with cabling)
- battery CR1632 easy to replace with flat head screwdriver, 1.5 to 2 years runtime
- unique ergonomics thanks to feedback from professional riders
- softer handle cover
- Servo Wave technology for optimal brake control
- 16.4 mm reach adjust
- wired mounting also possible
- funnel bleeding
- firmware updates via E-Tube Project
- connection with Shimano Connected partner devices from Garmin or Wahoo possible via E-Tube
- lacquered brake lever and buttons


STI Dual Control
Shimano Total Integration (STI) means the combination of braking and shifting functions in one lever, which increases safety when riding. By refining the technology, it became possible to make shifting so smooth at the front and rear that they can be triggered with just one finger. Shimano calls such levers Dual Control Levers (DCL).

Digital Integrated Intelligence (Di2)
Di2 systems are the electronic shifting systems from Shimano. They are based on the SEIS, the Shimano Electronic Intelligent System, which takes over the index shifting function from the mechanical components, only via power cables or radio signals and not via a Bowden cable. Shifting is done by simply pressing a button. This has the advantage that no great effort is required, your concentration on the ride is not disturbed and operation is easy even with cold hands. In addition, the electronic gear changes are very fast and highly precise. There is also no risk of a defective circuit due to dirty cables or other problems. You can adjust individual settings via the E-Tube Project, such as adjusting the shifting speed, the number of shifting operations per button press or the Synchro or Semi-Synchro shifting function. Shimano offers an app for this purpose. Gear maintenance and firmware updates are also done via E-Tube, with the bike connected to a PC running the appropriate E-Tube software for more extensive workshop work.

The Shimano Di2 12-speed road groupsets in the disc brake version work semi-wirelessly: at the crucial point, namely the interaction between STIs and rear derailleur, the cable is dispensed with, which makes for a tidy cockpit and considerably simplifies assembly. The wireless protocol is extremely fast and reliable, so that the shifting speed reaches a new level - with consistently high precision. Attention was also paid to keeping power consumption as low as possible. Cables are only used between the battery and the rear derailleur and between the battery and the front derailleur. These are thinner than the previous models and easier to lay. Shimano relies on a central battery located in the seatpost. This increases safety and ensures an uncomplicated charging process via the rear derailleur. Once fully charged, the circuit can be ridden for approx. 1000 km. If desired for peace of mind or other reasons, you can install the groupsets in the conventional way. The components are paired together via the E-Tube platform.

Servo Wave
Servo Wave optimizes the leverage of your brake levers. During the braking process, the brake pads are guided quickly to the brake rotor with very short lever travel. The greater part of the lever travel is reserved for the actual braking force. This technology allows you to control your braking force more precisely and to apply it more effectively.


Mount: left
Manufacturer Number: I-STR8170LA

Mount: right
Manufacturer Number: I-STR8170RA


- 1 x Shimano Ultegra Di2 ST-R8170 shift/brake lever
- 1 x CR1632 batteries