Originally Posted by
leo95se
I found this as a valuable guide. Like others have said, the eww01 is key. Note that to get there it may require a battery upgrade.
Edit- I can’t post links yet sorry
search for di2 compatibility chart.
Just to clarify:
SM-EWW01 is the previous generation unit, it does (private) ANT
only. It will work with any battery / battery mount
EW-WU111 is the 2-port inline wireless unit. It supports BluetoothLE and ANT. You need BT-DN110 or BM-DN100. You do not have to connect both ports
EW-WU101 is also a current generation wireless unit. It is installed on the seat stay, near the RD. It supports BluetoothLE and ANT. You need BT-DN110 or BM-DN100.