Hello, I am picking up a GP4 as the successor of my 2012 GP3. But also here I have the problem that I have loud rolling noises of the front tyres especially during motorway rides over 120kmh. I exclude tyres. I have already experimented a lot with my GP3. I think it only helps an additional insulation of the (maybe ) wheelhouse shells. Has anyone already had experience with additional insulation. Or are there autoacousticians who can locate the noise source? Greetings Klau s