Offset & Tire Question for s2000

Hi guys,

Sorry if the question have been raised before on this thread.
I have done my research, but still haven't found a definite answer yet.
I'm quite new to this thread. Bought my S2000 about 7 months ago.

I'm currently purchasing a wheel with 17x8 et40 front and 17x9 et40 rear.
I'm just wondering if 17x9 et40 rear will fit the fender with 255/40/17 semi-slick tire?
I know it will require rolling and tab relocation, but with 2.5-3 degree chamber will it require a pull?

Another option is since the wheel came with a 245/45/17 rear and 235/40/17 semislicks, will i be able to use that?
I know its an odd size, having the rear thicker that the front. But, let me know what you guys think?

Thanks :)

I run 17x9 +40 all round with 255 rs3
Front is the hassle. Rear will fit fine with a roll, tab relocation and -2 to -2.5 camber :)

245/40 will fit the rear easier with slightly less camber (I was at about -1.8 with my old 245s)