Running 305's on stock rims is fine, plenty of members here are running this setup. The mustang and camaro guys run fat tires all around all the time with no problem. Ive even seen a couple 315s on 10 in rims.
Also I'm pretty sure this isnt stretching the tire, in fact its bulges out.

You are stretching the sidewall beyond what it is meant to do. You are playing with words here....

ah gotcha, when i think stretched tire, i think of thishttp://japanesenostalgiccar.com/blog...re-560x418.png

It wont cause the tire to blow out or anythign of that nature but it does change how the tire sits on the road and from what I read that can be a very bad thing.

I think stretched tires are ugly and highly compromises safety. For daily driving, you can go one step up from stock for a little more grip. 255/45/19 fronts and 285/35/19 rears.

A mild stretch is actually beneficial as it serves to keep the sidewall stiffer, keeping the tire from rolling over it. By mild I mean the stretch we are running with 275s on a 10" rim.

I agree, but stretch like the pic above is just absurd.

275 on a 9" wheel is exact spec for width according to discount. You will not rub unless you lower your car over an inch. I'm running 275x35x19 on a 19x9 F and 305x30x19 on a 19x11 R with around a 1inch drop.

Don't be fooled, handling characteristics will improve. Nissan would dip into their profits by putting wider tires/wheels on the Z. I would say try to avoid increasing the stagger though. On a side note, it looks like there is plenty of room for 315s in the rear if you want a more aggressive look. :tup:

255/285 seems to work beautifully for me.

Has the 285/35 RE-11 tire been discontinued?

For some reason specs are not listed for it on Potenza website :confused:

No, they are just a-holes.

Ha ha ha -- okay, that's good to know :D

Reviving an old thread, but here's a good article to discuss the implications of tire width deviations. Essentially, all tires have a measured/advertised width when mounted on a rim of specified width. Say you have a 9" rim and a 255 width tire is measured on a 9" rim. You get 255 when you mount it on that rim. If you mount the same 255 tire on a 8.5" rim, you squeeze the tire and the width is actually less than 255...maybe 250 or 245. The converse is true if you mount the 255 tire on a 9.5" rim. Now it may actually have a tread patch width of 260 or 265.

Tire Tech Information - Tire Specs Explained: Rim Width Range