hi, I went for a 2 hour ride in the (heavy)rain a couple of days ago and when i got on my bike the following day i noticed a weird noise coming from the rear wheel. It sounded as though some grit had got in to the bearings so i cleaned and repacked the bearings and the noise is still there. I think it's coming from the cassette body because the noise is only there when i freewheel... Does anyone know what this could be or know a way that it can be fixed??? Thanks in Advance