Do we know what exactly the belt is rubbing against to make the noise? My guess would be the side of the pulley, which would stop it running off, if this is the case, then it would seem that the back wheel or the BB are out of alignment, maybe both, so it could be just a 'simple' [but probably time consuming] job of realigning them.
Maybe I'm wrong and the noise caused by something else entirely, but I can't see what.
Has anyone emailed the factory to ask them?
