Hi Christo76:

No, I have not noticed any vibration. However, typically if you feel a harmonic vibration in the steering wheel when rolling it is either tire or wheel related. Perhaps the cause could be:

1) Out of round tire
2) Slipped radial belt in tire
3) Wheel slightly out of balance (thrown weight or not balanced well)
4) Wheel slightly bent or deformed

If you can, have someone follow you and watch you wheels at the speed the vibration is most noticeable. Perhaps they will be able to visually see which tire/wheel is rebounding.

I had this problem with my Cobra when I had some new tires put on it. The problem was a bad tire with a slipped radial belt. The tire dealer had one of those new computer Hunter balancing machines which checks rim roundness and tire roundness and the tire was at fault. New tire did the deed.

I would bring this up with your service manager were I you.