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The 1 series is a b*tch for fitments, so most non 1 series specific rims are a bad fit. At 25mm further outward, you are pretty much going to be outside of the body....so it's not a matter of a "Little rubbing" IMO, as soon as the suspension compresses more than a couple of inches, there will be contact as the fender lip is quite thick in the rear....
For example, I upsized to a 255/35/18 in the rear, and added a 10mm spacer (so that's ET42), and I was getting a fair amount of rubbing on medium bumps. Had to get a mild fender roll and dial in some additional rear camber to sort it out. There is still minor contact with the fender liner (no body contact though), at this point the tires have worn small holes into the fender liners so they don't really touch anything anymore...
If you're talking what is effectively a 25mm spacer....imagine how much worse it would be. Maybe with super skinny tires...but I have my doubts.
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