[Mini Mize]

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[FlashMonkey929]

Have you checked your manual? You can change the tire size stored in the system to match what you have switched to. Tire sizes supplied by the manufacturer may have also been differentiated by trim level and/or market. For reference, I have a US with M Sport, 10/22 production and have 225/55/R18.

[LindrelT]

Originally Posted by MAPMAN48

I think that answers all my questions except when and why BMW changed from 225-50-R18 to 225-55-R18. Or maybe they fit either depending on availability (or price)
Thank you. Much appreciated.

The rolling diameter of all the wheel size choices (18/19/20) have to be the same and go with the drive ratio designed in that model. With F48 they used a 50 series on the 18” - already fairly low profile. Means the tire profile on 19”/20” gets pretty low. On the U11 by having the 18” have a 55 series it opens up having bigger wheels without getting down to 35 profile tires.

(Given same/similar width wheels/tires…. And yes I spell tyres incorrectly)

[FlashMonkey929]

[QUOTE=MAPMAN48;30350338]I think that answers all my questions except when and why BMW changed from 225-50-R18 to 225-55-R18. Or maybe they fit either depending on availability (or price)
Thank you. Much appreciated.

Mine was one of the earlier production models and I have the taller sidewalls 🤷🏻‍♂️
Maybe someone with a September/October base or X Line can confirm the 18” wheel tire size? As far as I know they didn’t change here in the US.