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R8050 Di2 - Chain/Cassette Grinding?

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R8050 Di2 - Chain/Cassette Grinding?

Old 03-30-20, 08:58 PM
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Dreww10
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R8050 Di2 - Chain/Cassette Grinding?

The Di2 setup on my bike was fine for a couple of years and has recently developed a grinding sound in the cassette when in the big ring, but only in some cogs and not others. If I hop down to the little ring, and stay in the same gear in the rear, the sound is gone. The sound isn't exclusive to the cogs at either end of the cross chain spectrum, but does so in some of the center cogs but not others. It isn't a sound like an untuned mechanical derailleur where the chain is hopping between two cogs and going clickety-clack -- in this case it's fully shifted into the gear, but for whatever reason is just simply grinding.

I've been studying up on micro adjustments, but since it sounds fine in the small ring, and the adjustments are universal, I'm not sure how adjusting that is going to fix a problem in the big ring but not the little....afraid I may just mess up the whole thing.

Thoughts?
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Old 03-30-20, 09:08 PM
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Steve B.
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When was the last time you changed the cassette and chain ?, worn out maybe ?
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Old 03-30-20, 09:11 PM
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Dreww10
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Originally Posted by Steve B. View Post
When was the last time you changed the cassette and chain ?, worn out maybe ?
Chain has been checked and is not over-worn. Cassette is the original and doesn't have enough miles to be worn. And, because it doesn't grind in the little ring, I would assume it's not that.
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Old 03-30-20, 09:26 PM
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Steve B.
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I’d micro adjust anyway while in the big ring as the chain angle changes. See if it develops a noise in the small ring. Pay attention to how many steps you change so you can put it back as needed. I think it’s 16 either way from centered, but it’s been a while.

Other stupid things that caught me was not paying attention that 11 spd. chains have a direction when they are installed. My first chain on the original install was noisy and I just assumed it was that way. As I’m really hard of hearing it never bothered me and shifted fine. Chain 2 I installed correctly, it was much better.
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