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255/35/20



The 3% is for difference in size between two tires. 3% added to 26.7" is 27.5" and that definitely isn't fitting without rubbing issue.
 
There should be no rubbing with the correct offset.

GXP's ran 255/45/18 up front, those are 27.04in and the 255/35/20's are 27.02in.

You can run a 245/45/18 all corners without rubbing aswell with stock 18x8 rims, bumping up to a 255 section width shouldn't change anything either so long as the offset stayed the same. We are only talking .3in wider tire here.

If he ran a +45-50 offset wheel to match the factory rims, it should be pretty problem free.
 


Well I'll find out later today. I have 8" all around running 255/45/18's and I never had a issue even loaded up. Granted these are 20" vs 18", but my rear suspension has been replaced and doesn't sag. I'll post a update once I have the tires mounted.
 
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