Check Di2 shifter battery level and replace it
12-speed wireless Di2 shifter batteries last about two years, and this page will teach you how to check the battery level and replace the battery itself.
Disc Brake Dual Control Lever (Wireless)
Ultegra ST-R8170
Just like the previous generation R8070 Ultegra dual control levers, these have 'hidden' buttons on top of the shifter hoods. You can set these up any way you like and I wrote an article on just that: setting up the Di2 shifter hood buttons.
Wireless and wired
While these shift levers support the new wireless Di2 shifting, you can also choose to connect it using EW-SD300 wires. Doing so will improve battery life by approximately 50%.
These shift levers have one SD300 port and one satellite shifter (SW-RS801-T / SW-RS801-S / SW-RS801-E) port.
Affiliate Links
Using the affiliate links to purchase anything earns the site a small commission, at no additional cost to you.
Updating wireless levers
While you can customise these levers and change button assignments using the mobile app, you cannot easily update them. The levers need to be wired to the rest of the system in order to enable updating via the mobile app.
I have written a guide on updating 12-speed wireless dual control levers. Read that if you're stuck updating your levers, or simply send me a message.
If video is more your thing, watch Rides of Japan update his levers below:
Specifications
- Model code: ST-R8170
- Series: Ultegra (R8100)
- Weight: 195g (per lever)
- Speeds: 12
- Number of switches: 3
- SD300 ports: 1
- Satellite Shifter ports: 1
- Battery: CR1632 (1 per lever)
- Wire shifting: Yes
- Wireless shifting: Yes
- Servo wave: Yes
- Free stroke adjust: Yes
- Reach adjust: Yes
- Brake type: Disc
Related components
View all componentsRelated pages
Building a 12-Speed Di2 Road Bike - components and wiring
Building a 12-speed Di2 bike involves a couple of steps and decisions to make. Are you building a rim brake bike or a disc brake bike? Will you connect the shifters wired, or run them wireless? What cables and what length do you need? I'll guide you along the process.
Change button setup - enable buttons on Di2 shifter hoods
Modern Di2 shift levers have buttons on top of the hoods, but unless you're on 12-speed Di2, their default function only works with a wireless unit or d-fly. Learn how to set these buttons to shift derailleurs.
Update the firmware on 12-speed Hydraulic Shift levers
Updating 12-speed Di2 R9270/R8170/R7170 shift levers is not as straightforward as you might think. You need either the SM-PCE02, or connect the levers to the rest of the system using an EW-SD300 wire.
Pair 12-speed Wireless Di2 Shifters
I'll show you two different methods of pairing 12-speed Di2 wireless shift levers - using the mobile app and using wires.
Change your Di2 lever free stroke and reach
Do you have small hands? Or extra large hands? Read this page to figure out how to change your Shimano Di2 shift lever (or shifter) reach.
Unpair 12-speed Wireless Di2 Shifters
Unpairing 12-speed Di2 wireless shift levers can be done using the mobile app or using the SM-PCE02 and E-Tube Project for Windows. This page describes both methods of unpairing wireless shifters.
Manuals & other documents
More images