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Clunking in middle ring with new chain, could it be done so soon?

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Clunking in middle ring with new chain, could it be done so soon?

Old 10-14-15, 11:09 PM
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LlamaBikes
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Clunking in middle ring with new chain, could it be done so soon?

Hi, I just changed my 9sp chain after it reached the 0.75 wear mark on my chain checker. I also cleaned my cassette, chainrings and derailleur at the same time. When in the stand it shifts and looks fine. On the test ride while pedaling hard in the middle ring (it's a 24/36/48 triple) it makes a low grinding/clunking/chunking sound. At first I thought I'd try a new cassette because I had a spare kicking around, but that didn't fix it. I double checked the cable tension and that's all fine, so that leads me to think there might be something up with the middle chainring. It maybe only has 10,000km on it, I've replaced the chain before and not had this issue, so could it be a worn chainring that early?
I've swapped back and forth a few times now with the old and new chain and the new chain is definitely part of the problem. It shifts fine with the old chain.





Any thoughts welcome.

Thanks!
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Old 10-15-15, 01:03 AM
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Definitely sounds like worn chainring. New chain and worn ring will cause fair bit of vibration and makes the chunking sound you describe.

10,000 kilometers isn't totally unreasonable for an aluminum ring, depending what kind of life it's had.

Comparing the middle ring teeth in the photo relative to the big ring teeth, it does look pretty tired.
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Old 10-15-15, 06:46 AM
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See how the teeth on the middle ring appear to be leaning to the left? That's because the right side of each tooth is worn away. The teeth on rings and cogs should have symmetrical profiles.
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Old 10-15-15, 08:45 AM
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While you're taking the cranks apart to replace the middle ring (and I agree that it sure looks worn) do yourself a favor and remove and reinstall the BB. At best you'll confirm it's good condition and make for future replacement easier. At worst you'll discover it's being not as tight in the shell as it should have been or is also worn and wishes to be replaced. Also don't forget to grease the ring bolts, both insides and out side surfaces. Preventative maintenance is worth it to insure few future problems. Andy.
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Old 10-15-15, 09:20 AM
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Weird, okay, does that mean I should change my cassette too? I've only changed my chain once before this and I've been keeping an eye on it with the chain tool from the beginning, never letting it get past 0.75... I actually had ordered a spare chainring a few weeks ago at the LBS, it should be in really soon I'd think.
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Old 10-29-15, 10:29 AM
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I am glad I found this post.

I replaced a 9 speed chain and cassette and had grinding and clanking and rear chain hop on the middle ring.

So I replaced the rings and cables and it shifts like new.
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