Thread: Why 19" front wheels, but 20" rears?
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      10-07-2015, 11:34 AM   #7
mkoesel
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Drives: No BMW for now
Join Date: Jun 2006
Location: Canton, MI

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No real change in contact patch length.

Standard M4 rolling diameter:
F: 255/35 R19 = 26"
R: 275/35 R19 = 26.6"

M4 GTS rolling diameter:
F: 265/35 R19 = 26.3"
R: 285/30 R20 = 26.7"
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