Shimano Ultegra ST-6870 Dealer's Manual page 58

ADJUSTMENT
Adjustment of the front derailleur
Adjust the gap between the chain and
the front derailleur to 0 - 0.5 mm.
4
Press the button at junction (A) until the
red LED turns off in order to switch from
rear derailleur adjustment mode to gear
5
shifting mode.
0 - 0.5 mm
(G)
Turned
off
58
CAUTION
Move the front derailleur and the rear
derailleur to all gear positions, and check that
the chain guide does not touch the chain.
(G)
Junction (A)