Hello, Today our sportage was in the workshop, because for some time quite strong vibrations can be felt. Conclusion of the workshop: Tires are not round. They changed them from rear to front, which should have brought an improvement. The vibrations are less strong. To my question whether it would have been done for the workshop, he answered I should drive like this and see if it bothers me. Otherwise you have to look how to arrange. Tomorrow they want me a P Reis call for possibly 4 new tires. My question: can it be that tires that ran at first without any problems at once become unround? Storage over the winter can be excluded because they were stored lying down. It seems strange to me that tires become unround over the time. hankook ventus s1 evo2 suv k117a 245/45 r19 98w which are one year old and have about 4000km down, thank you