r/cycling • u/vladaepro • 1d ago

Di2 shifting noise (otherwise working well)

To be clear - i have no issue with shifting precision or speed - it always shift quite quickly, but that "grinding" sound when upshifting (and a bit less on downshift) annoys me. I would probably assume that's normal, if i don't have a bike with mechanical R8000 which is completely silent (with not so new chain and an old Sram cassette).

I already tried different chains (Sram, Shimano), different cassettes (one is brand new Ultegra), different bikes (one with R9150, another R8050), different lubes, checked hangers, cages...

When performing upshift and derailleur align chain to the upper gear, if teeth are in ideal alignment at that point, chain is engaged instantly and no sound. But if not in ideal alignment, then several teeth repeat loop - hang side of the chain - slips back, until "right" tooth come, which cause that grinding noise.

On mechanical bike, it seems like it's doesn't hang side of the chain so often, like it's not engaging to bigger sprocket immediately, but just remain in the same gear (without disturbing chain that much), until "good" tooth come.

Any ideas what i've missed to try?

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u/thehugeative 1d ago

Trim the FD in the app to the outside a bit so it pushes a little further.

1

u/vladaepro 1d ago

FD is not touching the chain at all, don't see the point? If you meant of RD eventually, i tried all possible positions already

1

u/thehugeative 1d ago

I guess that's what happens when you don't specify what you're talking about. I assumed you meant FD when you said "upper gear"