Ive got 17inch by 9 rear turbo twists. They currently have 255s on em. I want to go larger in the back and the next size of the same tire is 275. Will the 275 work with the 9 inch rim? And will it fit in the back of my 87 turbo? Thanks

 

I did it with mine but the offset was off so it scraped a little not because of the width of the tire. If I rolled the lip of the quarter panel, it would have worked well even if the offset was wrong. I have seen rolled quarterpanels take 315 width so 275 should be fine on the right wheel.

 

So they fit ok on the 9inch rim?

 

I have 993 cup 2's with 275/40's and they are ok.

 

I have 275-40-17 on CCW 10's with no issues.

 

I've had a 315 nitto drag radial on the rear little rubbing not as bad as my current wheels and tires are now though

 

Yes, they will work but they are a little large for the wheel.
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Yeah, on a 9" rim, you'd probably get better performance from a 255mm tyre than the taller 275mm one. Better on a 10" rim or best on a 11" rim. It will fit if you have the proper offset wheel, which is about +10mm more offset than stock.