6870 Di2 Rear Mech B-adjustment
Hi all,
My drivetrain has been sounding a bit noisy, despite the gears been trimmed perfectly so I thought I would have a play with the B-adjustment screw to see if I could fine tune the gap between jockey wheel/ cassette.
When I turned the screw I noticed that it was having zero effect on the position of the derailleur. In fact the ring which the screw rotates isn't actually in contact with the derailleur and the derailleur can swing considerably in both directions. I.e. it isn't bottomed out in either direction, therefore cannot be adjusted, it just hangs loose.
Has anyone comes across this? Normally I take care of this type of thing myself but I am stumped! There must be a simple answer...
Here are a few pictures, not sure if they wil help at all but just to show that the B-screw is engaged, while the derailleur does not contact the flat section of the rotating ring.
My drivetrain has been sounding a bit noisy, despite the gears been trimmed perfectly so I thought I would have a play with the B-adjustment screw to see if I could fine tune the gap between jockey wheel/ cassette.
When I turned the screw I noticed that it was having zero effect on the position of the derailleur. In fact the ring which the screw rotates isn't actually in contact with the derailleur and the derailleur can swing considerably in both directions. I.e. it isn't bottomed out in either direction, therefore cannot be adjusted, it just hangs loose.
Has anyone comes across this? Normally I take care of this type of thing myself but I am stumped! There must be a simple answer...
Here are a few pictures, not sure if they wil help at all but just to show that the B-screw is engaged, while the derailleur does not contact the flat section of the rotating ring.
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