I noticed a while back the rear wheel was making a high pitched whine. It was also feeling sluggish. So decided the brakes needed to be adjusted, but had difficulty in avoiding rubbing. Broke the brake noodle and flipped the bike upside down, gave the rear wheel a spin and noticed it wobbling. A hard enough spin and it looked like a sidewinder.

Took it to the LBS to have it trued, but the guy just said it was a broken spoke and replaced that while I waited. Took the wheel home and remounted it and everything was fine- until a few days ago.

I noticed similar whining and observed a slight wobble again. Not as noticeable as the last time, but it is there. I checked all of the spokes and can't find a broken one. I think a couple may be loose- they rub across each other like a bow on a violin- but all are anchored on both ends. Not wanting to risk breaking another spoke, I've been taking my son's BMX for the last three days. BTW, the U-brakes on that thing just SUCK.

Now wondering if just replacing that one spoke without tensioning the others at the time has led to the situation now. Considering getting a spoke wrench and attempting to tighten any loose spokes that I find, but from what little research I've done, just doing that willy nilly could cause even more damage...