12-speed Di2 New User Guide
Just bought a new 12-speed Di2 bike? This page explains what the buttons do, how to charge, and what synchronized shfit does.
Rim Brake Dual Control Lever (Wired)
Ultegra ST-R8150
The Ultegra R8150 Rim Brake levers weigh about 295 g for a pair of levers.
They're essentially the same as the previous generation Ultegra levers, except for the fact that they'll work with the 12-speed derailleurs - using the SD300 port type.
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Not wireless
Since these 12-speed rim brake shifters are essentially the previous generation shifters, they do not feature wireless shifting. You can only connect them to a Di2 system using EW-SD300 wires.
12-speed rim brake shift levers have two SD300 ports and one satellite shifter (SW-RS801-T / SW-RS801-S / SW-RS801-E) port.
Specifications
- Model code: ST-R8150
- Series: Ultegra (R8100)
- Weight: 148g (per shifter)
- Speeds: 12
- Number of switches: 3
- SD300 ports: 2
- Satellite Shifter ports: 1
- Wired shifting: Yes
- Wireless shifting: No
- Reach adjust: Yes
- Brake type: Rim
Related components
View all componentsRelated pages
Connect 12-speed Di2 shifters by wire
12-speed Di2 rim brake shifters can only be connected by wire - there is no wireless option for these shifters. Even if you're on wireless disc Di2, you may still be interested in connecting your shift levers by wire to increase battery life and eliminate wake up shifts.
Install 12-speed satellite shifters (EW-RS801)
Shimano 12-speed satellite shifters are tiny buttons or shifters that you can place in the drops, on the tops, or on your aero extensions. This page explains how to install the different satellite shifters and how to wrap the handlebar tape around them.
Installation guide: Di2 wired shift levers
Learn how to install Di2 drop bar levers commonly used on Di2 road bikes or Di2 gravel bikes. I'll walk you through the process and give you some useful tips.
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.
Manuals & other documents
Firmware updates
Below is an overview of all known firmware updates for this component. The changelog texts are Shimano's, and quite often they're a bit cryptic - sorry!
4.3.0
The firmware will be updated but it does not affect the use of ST-R8150.
4.2.0
- The FRONT SHIFT NEXT function is now supported.It is a function that allows you to shift up and down the front derailleur with a single button. * To use this function, assign “FRONT SHIFT NEXT” to a button on the wireless shifter/switch.
4.1.0
Adapted for new DU-EP801/DU-EP600.
4.0.0
Firmware released
More images