O/k in answer to some of your questions yes, Fashion wheels. No - the first size was 255- 30-20s, now they are 275-40-20 we wanted to fill the guards and not lower vehicle to retain softer ride and handling.
Before with rubber bands on
Now with bigger tyres fnt and rear
The new tyres seam to me to do the car more justice and there is nil clearance problems on rear. (the fronts had to have 3mm put in but Shhhh!! )
The speedo was slightly out with the smaller tyres (using gps on mobile about 5ks out at 80k/hr)
As for the rolling diameter the smaller profile were near on two inches smaller in height at the fnt, the bigger ones are now within 10mm from factory wheel/tyre height.
Cheers Paul