Shimano Ultegra R8050 Series Dealer's Manual page 115

CONNECTION OF ELECTRIC WIRES
Connection of junction B
Built-in type (SM-JC41)
First pass the electric wires for junction A, the battery mount, the front derailleur and the
rear derailleur through the holes in the frame into the bottom bracket shell.
Electric wire for rear derailleur
1
Electric wire for front derailleur
Electric wire for junction A
To be continued on next page
(A)
Electric wire for battery mount
[In the case of an external battery
(SM-BTR1)]
Electric wire for battery mount
[In the case of a built-in battery
(SM-BTR2/BT-DN110)]
115
(A)
Bottom bracket shell
TECH TIPS
The electric wires for built-in use can be
inserted only in one direction.
Make sure that you insert them from the
direction shown in the illustration.
Wire holder