Like it's DURA-ACE sibling, the Ultegra R8070 Dual Control levers feature hidden buttons on top of the hoods. These buttons can be programmed to do anything.
Most riders seem to set them up to change pages on their head unit, or to change synchronized shifting mode. You need a wireless module in order to control your head unit or bike computer.
I wrote an article on setting up the buttons on your shifter hoods, so go ahead and read that if'd like to learn how to do that.
The R8070 shifters support hydraulic disc brakes and feature two e-tube ports, but no sprint shifter port. They weigh 180g each. Only the SW-R9150 sprint shifters will work, but they are a lot bulkier than the older (but incompatible) SW-R610 shifters.
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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.
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.
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.
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!
3.3.0
Changes due to the release of firmware for related units. (No change for the use of ST-R8070)
3.2.1
-Added interchangeability between SHIMANO STEPS with Road components.- Adopted models （ST-R8070/ST-RX815）
3.1.0
Additional ANT function for D-FLY channel switch setting (cycle computer setting)
3.0.1
Adapted for ULTEGRA Di2 (R8050 series)
