what is the biggest size wheel you can put in the rear? 11 or dont some people make a 12-12.5" wheel? I have been thinking about getting Fikse FM5s whats the biggest I can put under the rear?

thanks

 

You can get an 11.5" wide to fit with a little modification but requires very precise measurements to get the offset and back spacing right (at least to run a 335 on a lowered car)

 

is that what you're running?

 

yes, I am running 18x11.5 iforged Aeros w/ 335/30 18 Michelin Pilots on the back. The car is lowered. I had to hammer the inner fenders like some people do w/ 315s. I need to roll my fenders because they rub a little on big bumps and dips but not very bad and wouln't be an issue if your car isn't lowered as much as mine

 

is the back spacing or anything odd?

 

To be completely honest I do not remember what the actual back spacing and offset ended up being since I got these wheels o year ago. They were basiclly the same dimensions as the TT2s but the additional width was added to the back of the wheel.
I am not saying that everyone will be able to run these. I had VERY VERY light rubbing in one spot on the drivers side with the 11" wide TT2s. one tap of the hammer was all it took. If you had to pound the hell out of the inner fenders to get 11" wide wheels to fit then you may not have much luck with an 11.5" with a 335 tire.
iForged did a great job on the rears but man the f#@$ed up the fronts big time. The whole offset and back spacing was off. The wheels did fit but they were NOT built to what I ordered to built the same as anyone else that got them for an F-body. It is a very long story but bottom line is they said they would fix the problem for me and then when it came time to fix it they wanted to charge me for it. I was not about to spend even more money to fix a problem that was their fault. If they had built what I wanted and asked for they would not have had to deal with the problem of fixing the wheels.

Sorry for the rant but every time I think about their service I just get a little upset.