Disc Brake Dual Control Lever (Wireless)

105 ST-R7170

The 105 ST-7170 Hydraulic Disc Brake levers weigh about 211 per lever.

Unlike its sibling 12-speed shifters (ST-R9270/ST-R8170), these 105 levers do not have 'hidden' hood buttons. They also don't have a satellite shifter port.

They do however support wireless shifting, and take two CR1632 batteries per lever. Also, the single E-Tube port (SD300 type) can be used to update and troubleshoot the levers, but you cannot use wired shifting with these shifters.

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Alternatives - compatibility

Let's say you just bought a 105 Di2 bike, but really want the hood buttons or the ability to connect satellite shifters (SW-RS801-T / SW-RS801-S / SW-RS801-E).

For example, because you want to be able to shift from your clip-on aero bars.

These shift levers don't support any of those, but don't worry - 105 Di2 (R7150) is fully compatible with the DURA-ACE and Ultegra 12-speed shift levers.

You could upgrade the levers to (ST-R9270/ST-R8170), while keeping the other components at 105 level.

Rim brakes

If you're looking to build a rim brake bike, you won't be able to use 105 shift levers.

Again, there are compatible Ultegra and Dura-Ace shifters, and these do support rim brakes. Note that 12-speed rim brake shifters can not be used for wireless shifting: