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That's very odd, we have definitely not heard of anything like this especially with alignment specifications set as OEM and even when 1-series owners use the meatier tires such as Michelin PSS, Dunlop DZII, and Hankook RS3s. Going back to your photos in the first post, the tires surely do look much meatier than most other street tires. A spacer would alleviate the issue in the rear, but the front rubbing can be due to the caster being off, and having a spacer might not change anything as the tire is coming in contact at the fender liner. It will, however, alleviate any issue that you are having with it hitting the struts in the front, which leads us to believe that the Pirellis run wider than others since this isn't an issue with any other street tires from our experience. We have heard of this being an issue for those with aftermarket oil coolers, but from what I've gathered, your car is mostly OEM.
If you do use a small spacer in the front, you would need to try to maximize the negative camber so that you can allow for better fender clearance in the front, which can be done by pulling the alignment pins on the top of your front struts. There is a chance that because the Pirellis are so tall, you may need a lower aspect ratio for the front tires to have adequate clearance, but we are really curious to see if anyone else has run the Pirelli tires on the same car before to see if they also had the same issues.
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