Why 9'' all round?
You get the concave look all round with that width. A lot of guys in the US run it.
Not quite true. You could get two pairs of rear wheels (concaved ones) and still have them staggered. They wouldnt quite be the same dish, so if you were to get two rears, I guess you'd get them the same width to keep the dish the same front and rear. Its the fact that they are the rear wheels that gives the dish. Front wheels are flat. You can run either fronts all round or rears all round if you want.
TBH I think I would always go with a stagger. Having front and rear the same width has to have an adverse effect on handling versus the OEM setup.
Eh? AFAIK the Rotas come in different widths and offsets but not "front" and "rear". Its the combination of width and offset which gives the concavity.
The same width rim front and rear shouldn't have an adverse effect on handling but same size tyres front and rear might.
Probably me getting misinformation off my350z then. They bang on about P45F and P45R which are the US GTRs.
Not saying you're wrong mate (probably me) just that I'd never heard of it. Phil will no doubt set me straight in due course. Still can't see a problem with same width rims though - OEM are same width aren't they?