My bike makes a rubbing noise and I think it's coming from the brake discs?

The sound only occurs when I'm mounted on the bike. I've lifted both wheels up and let them spin freely and there is no noise. The noise sounds a bit like when you rub 2 plates together. Anyone have any possible diagnoses? I'm pretty sure it's the brake discs although I don't see them or hear... show more The sound only occurs when I'm mounted on the bike. I've lifted both wheels up and let them spin freely and there is no noise. The noise sounds a bit like when you rub 2 plates together. Anyone have any possible diagnoses? I'm pretty sure it's the brake discs although I don't see them or hear them rubbing when I'm not mounted.
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