Having had a vibration at 55/ 60 mph for over 20 years I was surprised to find the cause
I had full Wheel Alignment / Balance and new Tyres fitted but did not fix the issue
Even had the Drive Shaft checked out
The the wheel had been fitted loosely after a puncture years back by the original owner the Mechanic thought
It appears to have been only hand tightened causing the stud holes /two in the rim to be slightly elongated
It takes someone with experience to find these minor things