I had measured mine for when I was looking to modify the rim to fit a standard 16″ tire. In fact no modifications are necessary and 16″ tires fit fine.
But here is the info off my standard wheel (they are not so old looking now 😀 )
And my local tire fitter did the balancing with no problem, I hadn’t assumed there would be. Unlike my 2CV which are impossible to balance here but which I found out since, not much point either 😆
[attachment=0:y5vgdc8x]wheel dimensions.jpeg[/attachment:y5vgdc8x]