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@Holmes321
So I've just finished up a new build https://www.lfgss.com/conversations/302299 and am having problems with a noisy chain.
I measured front chainline and calculated the back from Sheldon's data and think it shouldn't be more than 0.5mm out (of course my measurements may be less than perfect).
Vids of funky noise:
1: https://youtu.be/g8OuTUlgm4A
Filmed from side. This video makes the noise sound louder than it is really, but will give you a good idea of it. (p.s those are not my pink trousers).
2: https://youtu.be/1UH3vfTY4qA
Filmed from the back of the bike. In the slow-mo section you can see that sometimes the chain looks a bit "S" shaped (see 00:22) and other times it looks okay. You can see it most obviously if you just skip through the video while paused.
When looking from above the chain seems to flick left and right a little, seemingly randomly rather than systematically.
I did buy the chainring 2nd hand off eBay, so do have the one that came with the (new) crankset - could try that but would rather not.
I've tried the chain tight as the proverbial anoos, and loosey-goosey. Maybe a little quieter when loose but not sure if in my head.