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Notes:
1. The 20” rims+ tires are larger in diameter even though the 20s have a lower profile. 275/30/20 have a diameter of 26.5”
2. My 19” rims + tires are 26.4. That’s 2.5mm smaller
3. The fender to tire top gap on my M3RWD varies front to back, with the front having 10mm more gap.
I measured roughly a 16mm total reduction between my M3RWD with 19” and the M3P+. Error 10-20% as I was just test driving the 20” car.