[W126 Coupe] Vibration between 45 and 60

[Rattie S]

Hello,
 
I recently had some work done on my car. The work was a regular tune up, transmission tune up and replacing the center link of the steering. I also had put 4 new Pirellis on the same day.
 
Right after this was done, I took a 4 hour drive to Ithaca. The car has been acting strange. I could feel some vibration precisely between 45 and 60 miles / hour. And it doesn't matter whether I am accelerating or decelerating. Do you guys have a sense for what it might be?
 
Thanks in advance.
 
Itrat
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