Shimano Ultegra R8050 Series Dealer's Manual page 30

INSTALLATION
Electric wire wiring diagram (junction A side)
EW-RS910 (Built-in frame type)
Drop handlebar type
EW-RS910
ST-R8050/
ST-R8070 (L)
(A)
(z)
(B)
SW-R9150 (L) SW-R9150 (R)
EW-JC130
EW-WU111
(C)
ST-R8050/
ST-R8070 (R)
(B) (A)
30
E-TUBE connector
(z)
To frame (EW-RS910)
(A)
Port for remote sprinter shifter
(ST-R8070 does not have this
port.)
(B)
E-TUBE port ×2
(C)
Wireless unit