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Every moving part is clean and smooth until they are asked to cooperate with each other.
The most annoying noise source in my experience is the one from non-moving parts, because you can't really replicate it well at home. One source of faint rattling I found at some point was one of the stays from my rear mudguard: the bolt holding it place is absolutely bombproof, there is zero movement there, I thought it couldn't possible rattle. Turns out that the end of the stay that sticks out a little bit passes the rear reflector, apparently a bit too closely. And when there's a bit of road buzz, the mudguards start vibrating sideways a bit. Not a problem anywhere else but at that specific spot, where the sticking-out bit of the stay starts to hit the plastic reflector every so often.
Fixed it with two layers of electric tape wrapped around it, so that part was super easy. But finding that bastard was so annoying, because you just cannot get it to rattle when standing still, and it doesn't look like it would be able to cause noise. (Plus the mudguard is plastic and I for one tend to look for metal bits making noise...)
I'm not ashamed to admit i was close to tears on Saturday after taking the bike apart for the third time and the noise is still there. Every moving part is clean and smooth until they are asked to cooperate with each other.
I feel like the new stepmum who no matter how hard she tries just cant get the child to behave!