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5 comments
Could be the pivot bolt that attaches the derailleur to the frame. You'll need to undo the cage to get to it, but the pivot bolt is just a hex key fitting (careful you don't displace the spring inside as it can be fiddly putting it in the right place).
Edit: I've just had a look at the exploded view (https://dassets.shimano.com/content/dam/global/cg1SHICCycling/final/ev/ev/EV-RD-R8000-GS-4285A.pdf) and I'm thinking of the pivot bolt that attaches the cage to the derailleur body, not the derailleur to the frame.
It is not the pivot bolt, that is in order. It is just the cage that has a small amount of play from the body, with about, with enough movement to make shifting slow or skip.
The pivot arm comes as part of the outer plate assembly with the derailleur. There is also a T10 bolt that holds it in place.
If it is just the pivot arm and/or T10 bolt that is excessively worn, I can get a replacement, but I don't want to burn more money on the mech if the internals of the derailleur body are also worn out.
Yeah, I meant the pivot arm that connects the outer plate to the derailleur body. Every few months, my one comes loose (different version derailleur though - mine's Di2) and when I notice shifting issues, I have to remember to tighten that bolt up. (I don't think it's wear related, but more likely due to me mucking around with changing the cage to a fancy after-market one with oversized pulley and then changing it back when it didn't work very well.)
The bolt holding the outer plate is as tight as I can get it but there is still a small amount of play.
I want to be certain that a new outer plate assembly will fix the issue as I don't want to waste money on it if the derailleur body overall is also knackered.
Sorry, I can't provide any certainty. I'd be tempted to try adding a washer to see if that removes the play. With mine, if I tighten up the pivot arm too much, it stops the cage from moving at all, so I have to loosen it very slightly until the cage pivots correctly.