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I’ve got factory 21” wheels and Continental run-flat tires on my ‘20 X5 M50i. Been trying to find summer performance non run-flats to replace the Continentals. I’m having a heck of a time, however, finding anything in the factory size: 275/40 front, 315/35 rear. Looks like there are quite a few decent options though with +5 sidewalls. Tires I’m considering are same as factory widths, but with 45 front and 40 rear sidewalls.

Has anyone gone slightly taller than factory aspect ratios? By my calculations, +5 would add only around 1/2” to the sidewall. I realize the speedometer and odometer will be off just a little, and the ride may be a little softer, but are there any other noteworthy issues in going up just +5?

I’m considering this purely because of availability, not for increased comfort. I wouldn’t mind, however, filling out the wheel arches a bit more since I’m not considering a drop. Finally, in case it matters, my X5 has DHP. Thanks...