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I was looking at a spare tire offered by BimmerZone. Seems like the one they offer for our F30 with 18" rims is:
145/70-18
The original wheels I have are staggered at:
225/45-18
255/40-18
And their site states that the spare would have the exact diameter as the wheels, therefore keeping all sensors happy. You do have to use a spacer ring, but it's included in their kit.
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