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I had 18x9.5 +20 with 265/35s on my 32 GTR. No rub whatsover, they were perfect size.

I would therefore suggest that with 255 tyres you won't have any problems. 265 you may get a little guard rub. Easy fix if you do get rub, just lip the gaurd.

it's not a question anyone can really answer. so many things will affect it.

ride height?

camber?

castor?

tyre profile?

tyre width (not just stated width, actual width. it varies greatly between brands, and models)

all those things have a massive influence on things.

17X9.5 +15 is pushing it. but should be fine depending on how big the tyres are (i would go for 245 or 255 if street tyres, or 235 or 245 if semi slicks). and again wheel alignment makes a big difference.

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