this is a thread for all those various noises and clicks and squeaks you get on your bike when you do something just so. we all know what it's like. some of the most useful advice i've had on this subject is "wait until something doesn't work." because a lot of the time, it seems like that's all that you can do.
but we've all had various noises here and there and some of them, we've managed to pin down. for example, i had a click that seemed to be coming from the bottom bracket every power stroke. it turned out a bit of lube down the seat tube fixed that, as it was just pieces of the frame rubbing together (and a thorough inspection revealed no cracks).
right now, i've got two things that are bugging me. thing one: in my middle chainring (this seems to happen in neither the big nor little), and in the low (rear) gears, there is a grindy feeling on my left power stroke. doesn't happen with the right. it gets lessened as i shift up into higher cogs. it feels ALMOST like the chain grinding against the derailleur, but it's a bit "softer", and i've verified that it's not that. i've been messing a lot with my front derailleur, so i think that might be a source, and i know the ring is out of true by about a half mm. so: grindy, lessens in higher gears, but only happens in middle ring. anyone ever have something like this?
thing 2: there is a weird "pling" sound when i shift my rear derailleur under force. it seems to usually happen when shifting down, but i usually use more force when shifting down (e.g. going up a hill), and i'm pretty sure i've heard it shifting up, too. it's impossible to reproduce, but it doesn't sound healthy, and i want to find out what it is and get rid of it. it sounds like it's coming from the derailleur itself, but we all know how unreliable that assessment can be.
any words of wisdom? anyone else have any thoughts or questions or potentially relevant anecdotes?