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I have staggered 18" from factory on my 2021 M440i xDrive (in Europe).
I have realized that when times comes to replace tires, there are not much to choose from if I want to stay with BMW recommended (star marked), and I plan to do that. I asked Michelin about rolling circumference of their PS4 models in these sizes (which were star-marked but not suggested by Michelin web-tool for my car). The answer I got showed a difference of more than 1% even in the same "nominal" size.
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