I have a 92 CBR600F2. There is a rubbing noise that increases with frequency as the speeds increase. It is not a constant rub, but more on just one part of the rotation of whatever is rubbing. It sounds like it is coming from under neath the rider in the engine area. I'm pretty sure it's not the breaks because when you apply the brakes, the noise is still there. The sprockets are tight and the chain is good. For a short period tonight I could feel it in the rear tire (like going over small bumps, except this was a smooth road) and for the last mile of my ride I could feel it in my foot pegs. Pulling in the clutch makes no difference in the noise. Applying the brakes makes no difference either, other than the fact that the frequency slows down as the bike slows down. Also now that I think of it. The bike has gotten a wee bit wobbly on me this last week or 2. Not extremely, but noticeably wobbly.