Sorry all, just realised my calcultions were confused by a decimal point on my reply!! Schoolboy error.

I should have explained , the car is on route from Japan and I'm looking to have new wheels with uk legal tyres awaiting arrival.
I'm confident the rolling diameter etc is all within acceptable tolerance, but I'm unsighted as to how much gap is available from standard wheel to arch outer edge, to fill. I know et47 works.

On et35, the full 39mm extra width is all on the outside of the hub - I just don't know how inset the originals are and therefore if the wheel face and tyre will be legally inside the arch edge at that level.

I just don't want to order et47 and then have to fit spacers!

Trouble is I know nobody locally with an NA1 NSX with standard wheels to check.

Thanks for the help/input