Disc Brake Dual Control Lever (Wireless)

Ultegra ST-R8171

ST-R8171 is an updated version of the 12-speed ST-R8170. It supports wireless shifting only, and also wireless pairing without the app.

Other than that, they're pretty much identical to the older ST-R8170.

They 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 only

These shift levers have one SD300 port for diagnostics/updates, and one satellite shifter (SW-RS801-T / SW-RS801-S / SW-RS801-E) port.

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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-R8171
Series: Ultegra R8100
Weight: 195g (per lever)
Number of buttons: 3
SD300 ports: 1 (diagnostics/updates only)
SD300 satellite shifter ports: 1
Battery: CR1632 (1 per lever)
Wireless shifting: Yes
Wired shifting: No
Servo wave: Yes
Free stroke adjust: Yes
Reach adjust: Yes
Brake type: Disc

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FC-R8100

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Shadow Rear Derailleur (12 speed)

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Rim Brake Dual Control Lever (Wired)

BT-DN300

Internal Battery

EW-EC300

Internal Battery Charging Cable

SW-RS801-S

Satellite Drops Sprint Shifter (12-speed)

SW-RS801-E

Clip-on Aero Bar Satellite Shifter (12 speed)

SW-RS801-T

Satellite Tops Shifter (12 speed)

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September 1, 2026Installation Guide

Pair 12-speed Wireless Di2 Shifters

Pairing 12-speed Di2 wireless shift levers can be done using the mobile app, wires, or using the SM-PCE02. This page describes how to pair via mobile phone, and E-Tube EW-SD300 wires.

July 4, 2026Installation Guide

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Improve your battery life by 50%. Learn the step-by-step for wiring your 2x12-speed Di2 shifters and why.

Di2 rim brake shifters can only be connected by wire.. and even if you're on wireless disc Di2, you may still be interested in connecting your shift levers by wire...