Looking to use 18x9.5 +30 nismo LMGT4 in all four corners, would they fit in the front with a +30 offset to clear brembos? If they do, would tires with 275 width fit without rubbing? Thanks.

 

Yes and yes.

 

Why do you want to lose the staggered offset? Go with 9.5 front and 10.5 rear.

 

I also plan to go with 9.5 all around--for wider tie fitment on front. 10.5 on back would be nice, but don't want to spend $$ nor do I want the extra tire width and weight on the back.

 

I think 9.5 all around would be a perfect setup for the track. Run 265 tires in the front, and 265-285 in the rear (depending on your power).

I run 265 tires all around, but I have the 18x8.5 in the front so the tire is a tad wide for the rim. Sometimes I wish I had 9.5 rims in the front too.

 

I am running 275/35/18 F ~ 275/40/18 R on four Nismo LMGT4 9.5s over Brembo track brakes. No rubbing of any kind. I like it quite a bit.
There are some pics here if you want
http://www.hypersprite.com/auto/tech-z-010/

 

non-staggered ftw. arent many successfull JDM time attackers that use a staggered setup. although the M-workz Z is using staggered 315/295 i think...he kinda has to though with 560 whp. if youre N/A non-staggered 275/35 all around is all you need.