I'm fitting some volk gtm 19x8.5 +42 front and 19x9.5 rear +43 wheels I bought off Craigslist. The front tires 245/35 fit no problem but the rears I'm off by like a 1mm to 2 mm when car is on load with 275/35/19. Really slight rub. I've been calling around tire shops and they are net help for finding the right tire fitment. So maybe someone here can help. I don't want to have a stretched look. But would 265/35 or 275/30 work? 255/35 be stretched? I'm dropped on h&r springs is350c.
http://m730.photobucket.com/albumview/albums/mrloomp1a/null_zpsd79f9a2a.jpg.html?o=0&newest=1

http://m730.photobucket.com/albumview/albums/mrloomp1a/null_zpsa7de0452.jpg.html?o=3&newest=1

 

I ran 265 on my old setup. You should be good! My rears were 10" though not 9.5". (+35 if that helps) I had a 10mm stretch, very slight.

 

Thanks for the help bleezy! Ive gone ahead and rolled the rear fenders to fit the 275s and no rubbing now. now im curious if 285/30/19s on my isf will fit on on the vert. a part of me thinks it would work even if the stocks are +55.

 

You're welcome!

Maybe it will, that's a beefy tire for the ISC. Let me know, I work for a wheel company and could always use some tire number knowledge!