Vibration in front end at 40 to 50 new tires have been balanced and checked 4 times can run up past 50 and put in neutral and no vibration as it slows down
Rotate your tires and if the problem is tires and wheels, the vibration will feel like it is coming through the seat. If no change, the problem is something else.
My money’s on CV joints as the speed is too low for tires.