You obviously don't know where wheels get measured from
A 9.5" rim isn't measured from edge to edge, it's measured from where the bead of the tyre sits. for instance a stock R32 gtst rim is 6" wide but the total width of the rim is 7.5". The same goes for diametre. the total diametre of the same rim is just under 17.5" but where the bead of the tyre sits is 16".
So according to your 'figuering' these rims should have a 153 tyre on them................