Hydraulic Disc Brake Dual Control Lever
The ST-R9170 Hydraulic Disc Brake levers have two e-Tube ports each and weigh about 160g per lever.
They do not feature the dedicated sprint shifter port, so using the SW-R610 sprint shifters is not possible.
If you really want sprint shifters then the SW-R9150 sprint shifter is the alternative. These shifters are a bit bulkier than the older sprint shifters, unfortunately.
I wrote an article on setting up the Di2 shifter hood buttons, so have a look if you haven't set yours up yet.
Details & Specifications
|Shimano model number:||ST-R9170|
|E-Tube Port type:||SD50|
|Component series:||DURA-ACE R9150 (Road)|
|Downloads:||DURA-ACE R9150 Dealer Manual|