Shimano Ultegra ST-6870 Dealer's Manual page 42

CONNECTION OF THE ELECTRIC WIRES
Connection of the Junction (B)
Wind any excess length of electric wire inside junction (B) to adjust the length.
Example of adjusting junction (B) length
4
Install the electric wire cover to the frame.
5
To be continued on next page
42
CAUTION
To ensure adhesion, before installing the
electric wire cover, wipe off the grease on the
frame with alcohol or a cleaner.