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  1. I love this question. I’ve seen it alot and it took me a while to fix it on my bikes. The teeth on the cog pull the chain down when releasing the chain from the cog. The noise is the chain getting pulled down then bouncing back up. The fix is to use a cog with shorter teeth or more easily, use a larger chain ring. For maximum quiet I prefer big chainrings and big cogs. 51T+ and 17T+. The chainring you’re using looks small and so does the cog. Also, Phil Wood cogs have some of the longest teeth not sure if that’s what you’re using. But thought I’d add that.

  2. chains too tight, try moving your wheel forward a little at a time, giving a few mm of less space on your drop outs n see if that helps.

  3. Chain looks tight. Chainrings / bolt holes aren’t always perfectly round / aligned. Add a touch of slack and the whole thing will run smoother

  4. Does it sound like a rollercoaster going up hill? That’s what mine sounded like, I think it was the chain line. I put a new chain on in the end and the sound went.

  5. tafsirunnahian on

    Chain seems too tight, also maybe the crank is bent a little bit. I’ve similar problem where the chain was too tight and the chainring was also a little bent. The rattling noise of those rollers also indicates that the chain is not properly lubed.

  6. Might be same problem as I had, the chainring being too small. What I mean with this is the bolts of the chainring are so close to the teeth that the chain actually hits the end of the crankarms or the chainring bolts every rotation, making really crunchy sound.

    In my case I had 38t on 130bcd crankset which is the smallest possible tooth count you can have on 130bcd. Solution would be to get a bigger chainring.

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