Ever since I put on new rims and tires I have becime quite sensitive to the steering (slightly OCD.) With both hands resting lightly on the steering wheel while driving in a straight line it feels silky smooth until I hit 140 km/h and then I feel an ever so little vibration. I was told by my tire man that at a certain speed the steering rack adjusts/changes/adapts itself to the needs of higher speed percision and hence the difference I am feeling starting at 140 km/h. Is this a load of bull? These cars are so high-tech today seems like anything is possible. Thanks!!