Disc Brake Dual Control Lever (Wireless)
The 105 ST-78170 Hydraulic Disc Brake levers weigh about 211 per lever.
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, or wire them to the rest of the system.
Alternatives - compatibility
These shift levers don't support either of those, but don't worry - 105 Di2 (R7150) is fully compatible with the DURA-ACE and Ultegra 12-speed groupsets. You could upgrade the levers to (ST-R9270/ST-R8170), while keeping the other components at 105 level.
Details & Specifications
|Shimano model number:||ST-R7170|
|E-Tube Port type:||SD300|
|Component series:||105 R7150 (Road)|
|Downloads:||105 Di2 Wireless Shift Lever User Manual|