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First it needs to be understood that every upshift, the inner cable not only moves, but also the spring at the rear derailleur compresses, leading to a larger cable tension. This cable tension tends to compress the outer housing and seat the end caps a bit better. How much the outer housing compresses per every shift is dependent on many factors: (1) the ...


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Mixing of Shimano 10, 11 and 12 speed derailleurs and shifters is a poor choice because of the incompatability between speed classes. Each of the shifters from these speeds have a differing cable pull from the others--per shift, they don't pull the same length of cable. Differing by only a few tenths of a mm, it still effects the smoothness and accuracy of ...


1

I suspect you have cables and/or housings that are either old or off-brand. The friction in these can be surprisingly large. Thus the issue can be cable friction like Michael suggests. Cable checklist: Buy new Shimano 1.2mm stainless steel inner cable. If you have a recent system with a ridiculously high sprocket count, you may benefit from an Optislick ...


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I think it’s most likely that your cable has excessive friction, especially in the last part where it makes a tight bend from the frame into the rear derailleur. If you disconnect the cable from the derailleur (i.e. open the clamping screw) I assume it works as expected? Does this also occur on the big chainring? Otherwise it might also be a too long chain. ...


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That is the shift where having too much b-gap can cause the exact problem you describe, and the Roadlink is there to artifically increase the b-gap. It may not be solveable, and if it is then getting the b-gap as close as possible while in the large cog is likely going to be part of it. The caveat here is that if it's close enough to grind or touch, that can ...


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This is an old thread but people looking into this topic may discover it as I did so - Those that are considering the problem described above should simply buy an R8000 rear shifter and the problem is solved. July 2021


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One of the Shimano official facebook pages answered me, that this model of derailleur cannot be dissembled as I want. They've send me the same scheme I posted somewhere above (just the link is different): https://si.shimano.com/api/publish/storage/pdf/en/ev/RD-M3000/EV-RD-M3000-3841B.pdf


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The cause was neither poor lubrication at the freehub nor a weak rear derailleur spring. I investigated the bicycle carefully and noticed that mud at the rear derailleur pulley wheels was hindering the rotation of the pulley wheels. When riding the bicycle forwards, this probably caused slight power losses, only so slight that the effect was not apparent. ...


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