Shimano Ultegra ST-6870 Dealer's Manual page 23

INSTALLATION
Installation of the front derailleur
Adjust so that there is a clearance of 1
– 3 mm between the chain guide outer
plate and the largest chainring.
3
Use a Allen key to secure the chain guide
outer plate so that the flat part of the
plate is directly above the largest
chainring and so that the rear edge of
the chain guide is within 0.5 – 1.0 mm
from the front edge of the chain guide.
4
Position the front derailleur.
Position the front derailleur so that the
flat part of the chain guide outer plate is
directly above and parallel to the largest
chainring. Turn the support bolt with an
Allen key to position the front derailleur.
5
Clearance: 1 - 3 mm
(H)
(J)
(I)
0.5 - 1.0 mm
23
(H)
Chain guide outer plate
(I)
Chain guide
(J)
Front chainwheel
(largest chainring)
Tightening torque:
5.0 - 7.0 N·m
{44 - 61 in. lbs.}