Shimano Ultegra 6770 Series Manuals - Page 19
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By shifting from a large sprocket to a smaller sprocket, the rear derailleur will move
toward the outside by the over-stroke allowance and then move back.
8.
Adjust the B-tension adjustment bolt.
Set the chain onto the smaller chainring and the largest
sprocket, and then turn the crank arms backward. Turn the
B-tension adjustment bolt to adjust so that the guide pulley
moves close to the sprocket without obstructing the chain. Next,
set the chain onto the smallest sprocket and check in the same
way that the guide pulley does not obstruct the chain.
$ Adjustment of the front derailleur
Note:
* The low adjustment bolt, the top adjustment bolt and the support bolt are close to each other. Make sure that you are using the
correct bolt for adjustment.
Low adjustment bolt
36
Largest sprocket
Smallest sprocket
Guide pulley
B-tension
adjustment bolt
Support bolt
Top adjustment bolt
<Low adjustment>
Set the chain onto the smaller chainring and the largest sprocket. Use a 2 mm
Allen key to turn the low adjustment bolt to adjust so that there is a clearance of
0 - 0.5 mm between the chain and the chain guide inner plate.
<Top adjustment>
Next, set the chain onto the larger chainring and the smallest sprocket. Use a 2
mm Allen key to turn the top adjustment bolt to adjust so that there is a
clearance of 0.5 - 1.0 mm between the chain and the chain guide outer plate.
Move the front derailleur and the rear derailleur to all gear positions, and check
that the chain guide does not touch the chain.
0 - 0.5 mm
0.5 - 1.0 mm
37