Hi all
I have a strange issue with the clutch on my 11 speed GRX Di2 rear derailleur (everything is standard GRX besides the 11-40 SLX cassette). The shifting is terrible when the clutch is engaged, particularly in the small ring when shifting back up the cassette as it just won’t shift at all. The shifting is perfect otherwise. Micro-adjusting doesn’t help, the clutch has been serviced, I’ve tried another brand new rear derailleur, I’ve tried a new chain. I haven’t tried a new cassette as yet, but it doesn’t look worn. It’s not the end of the world, but it’s super frustrating at the same time!
Could be a slightly bent deraileur hanger.
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Well, you are running a cassette outside of the range of that derailleur which will cause the b-gap to be too big for crisp shifting down towards the 11 tooth cog. You said that the clutch has been serviced, but didn’t mention if the tension of the clutch has been checked. Shimano has a range for clutch tension and too high will cause poor shifting, especially in the larger cogs of the cassette. The new derailleur doesn’t necessarily rule this out because I have seen derailleurs set too tight out of the box. I honestly think it’s a combination of the two contributing to the poor shifting.
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