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I can lift the chain up to the middle of the cassette and then manually push the mech back, it feels like it has to go past a point then pops back into place.
This sounds exactly like the crash protection feature:
https://www.lfgss.com/comments/16091355/When you move the cage manually it pushes the tooth round until it reengages with the notch on the motor.
Though it shouldn't come apart willy nilly, obviously.
grams
cjr
Right, new issue with the rear mech (R8050).
When I try and explain it, it sounds stupid, but the rear mech has recently started undoing itself so the whole thing moves outward by almost the whole cassette distance. It's like the parallelogram is being inverted, so i'm in the 11t cog and it only wants to shift down.
I can lift the chain up to the middle of the cassette and then manually push the mech back, it feels like it has to go past a point then pops back into place. At first glance everything seems aligned but it has done it 3 times in the last two off road rides for no apparent reason, just when shifting it suddenly binds up.
Any ideas what is going on?