Hello, have a question and would be very happy about answers. The following: I changed from summer to winter bikes at my escort. Now these are extremely loud and “druff”. Very bad it is at about 80 km/h. Also it seems to me as if the wheels “flatten” a little… sometimes sounds like that. Now I was in a workshop and had all the wheels balanced out. Had about an imbalance of 0.25 (?) . It does not flutter now so much, but it is still roaring really well. I also changed the front wheels with the rear wheels for the “test”, but no improvement. Air pressure is 2.5 bar for all wheels. What I noticed is that there is a thin black line on the tread on some wheels outside… So as if the wheels are particularly worn out there. Does anyone have an idea to remove this roar or is there only a new purchase in view? Strangely, the “dry” last wint was he’s not yet… Thank you very much! Greetings Rudi