Help 275/30/20 (f) & 305/25/20 (r) on GT30's?
I am running 255/35 and 285/30 and I have absolutely no rubbing issues whatsoever....and that is with the Eibach PK.
I am actually considering 15mm spacers for the front and rears because I have so much clearance, but then I may run into rubbing issues.
I am pretty sure a 305 rear would fit no problem, but I am not sure about a 275 up front. Your offsets would have to be perfect. I have a +35 and +43 offset front and rear.
It also helps that I am running Falken 452s, where the tires tuck more than most and that my wheels were custom made to ensure no rubbing.
Why not just go with 255 fronts and possibly a front spacer for a more aggressive stance?
I am actually considering 15mm spacers for the front and rears because I have so much clearance, but then I may run into rubbing issues.
I am pretty sure a 305 rear would fit no problem, but I am not sure about a 275 up front. Your offsets would have to be perfect. I have a +35 and +43 offset front and rear.
It also helps that I am running Falken 452s, where the tires tuck more than most and that my wheels were custom made to ensure no rubbing.
Why not just go with 255 fronts and possibly a front spacer for a more aggressive stance?
okay I put on my GT30s 285 rear last Thursday and I had to raise back my car a bit because it wouldn't fit. The fender was basically sitting on my tire sidewalls and this was when my car was on flat ground! But then I was pretty low on my OEMs..
I trimmed the fender bracket completely. It's SHAVED, nothing left, barely anything but the bolt. I'm not rubbing anymore but going up driveways and big dips and bumps I can see the wheels getting tucked behind the fender and pulling against it.
Btw I have rear camber kit with -1.7 camber which is near the minimum of the factory spec range.
I can see fitting in 305 if I raise up more.. but if u plan on going low I would think either you need to run more negative camber or u can also relocate the fender bolt elsewhere u know (but Im not sure if this will help).
Really interested to know of the outcome! Keep us posted
I trimmed the fender bracket completely. It's SHAVED, nothing left, barely anything but the bolt. I'm not rubbing anymore but going up driveways and big dips and bumps I can see the wheels getting tucked behind the fender and pulling against it.
Btw I have rear camber kit with -1.7 camber which is near the minimum of the factory spec range.
I can see fitting in 305 if I raise up more.. but if u plan on going low I would think either you need to run more negative camber or u can also relocate the fender bolt elsewhere u know (but Im not sure if this will help).
Really interested to know of the outcome! Keep us posted

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The 9.5 (+35 mm offset) & 255/30 front is a perfect fit. The 10.5 (+37 mm offset) & 305/25 is not bad, but should've been at least an 11" with extra width tucked inside the fender, not coming out. Then, I believe, that running so much negative camber would not be necessary. I mentioned it before, and I'll say it again. I believe that with custom built 3-piece wheels, if they are measured and built properly, we can easily get larger than a 305 tire and even wider than a 11" wide wheel. If any venders want to sponsor me a custom built set, I will go even wider than 305's on the rear. Key word, CUSTOM!
pictures!!
The 9.5 (+35 mm offset) & 255/30 front is a perfect fit. The 10.5 (+37 mm offset) & 305/25 is not bad, but should've been at least an 11" with extra width tucked inside the fender, not coming out. Then, I believe, that running so much negative camber would not be necessary. I mentioned it before, and I'll say it again. I believe that with custom built 3-piece wheels, if they are measured and built properly, we can easily get larger than a 305 tire and even wider than a 11" wide wheel. If any venders want to sponsor me a custom built set, I will go even wider than 305's on the rear. Key word, CUSTOM! 

My front is -2.8 right now and I can't stand the sight of slanting wheels
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