For about 4 weeks I have had really strong vibrations in the steering wheel starting from speed 120Km/h. It is sometimes so strong that the arm is shaken properly. There are now two possibilities: 1. the tires of the Kumho Solus company replace each other unevenly (KIA dealer spoke of abrasion and pebble formation) – the tires have been balanced un twice and on the machine was shown zero – so TOP 2. The Sporti has a problem with the suspension Do you have any experiences, since I now between the Stühl sit and neither KIA nor reifen.com wants to do anything. Thanks for your postings