Originally Posted by Mahzari
BMW wants to keep as little stock of tires as possible, which is why the Forged 19s and the ZCP rims have the same size tires. If I had ZCP, I would go with 265/285 on PSSs because it does not rub and keeps the stock stagger while increasing the contact patches by a good amount
Actually this is totally wrong. The contact patch does not get bigger with wider tires of any type or any width, rather the contact patch changes shape and gets wider but not as long-more rectangular as the tire gets wider. That offers advantages in some areas and not in others but common misconception is it "increases" the footprint. Only thing that effects area of contact is PSI and mass of car.