I have the standard wheels.

Is this perhaps an obscure description of tram-lining?

Do you have 18" or 19" inch wheels?
Do you feel it all the time or on a particular road?

Wider tires tend to follow every little line and crack in the road, thats what tram lining is.

18" and I feel it on highways at over 60mph. Thank you for the clarification about "tram lining".
I have an appointment for Wednesday to check the balance.