I couldn't help but notice the other day when I was cleaning my NSR that the cloth I was using to clean my wheels was starting to go a bit red! I was using a Meguiars bike cleaning product, so I wouldn't have thought it was because I was using a harsh cleaning product. Also I am using a soft cloth, so I don't think it's that.

Could it be because the factory paint isn't very good? Or that the wheels have been repainted at some stage, with poor quality paint?

Cheers
Tom