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Is it bent? That's usually when the thing is hitting the limit screws.
EDIT: Nekature said exactly the same thing so I've typed this for nothing.
In other news 11-36 cassette coming from Shimano
hippy-
It works fine with your mech!
I've just put the wolf tooth in now and that has fixed it. It needed an extra quarter turn backed off the limit screw. Without it, it would do an upshift after a few seconds, presumably because it knew it wasn't quite on the big sprocket properly. I need to test it on a hill but it is working on the stand anyway.
The WT gives it space to get the extra quarter turn (and a bit more).
It's still really close to the spokes, though. I guess that is normal, just I don't usually look that close.
It has created another problem which is the cable is stretched really tight, which I'm not comfortable with. So I'll have to go fishing in the frame for the junction box and put a longer one on.
Unless Di2 extension cables exist... Which would save me half an hour's work at the expense of risk of water ingress and other failures.
Edit - looks like Di2 extension cables don't exist although plenty of other people are looking for them too! I'll have to fish the junction box out.
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In other news 11-36 cassette coming from Shimano
11 or 12 speed?
frank9755
Brommers
Is Di2 autoshifting up from the bottom (largest) sprocket to the next gear up when under load a known thing?
Mine is doing it. I've backed off the lower limit as much as possible, but if I relax it any more I get spoke jangling music.
I'll try putting a wolf tooth in and see if it fixes it. Might give a bit more room to relax the limit.