Quote:
Originally Posted by VisualEcho
Again, they used a 255/35 because the correct size of 265/30 wasn't available in the PSS.
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Again, the correct size would be 265/35/19 and not 265/30/19 for the M3/4 CS. The rolling diameter of a 265/30/19 front and 285/30/20 rear is way off. Please see below to get an understanding of how tire sizes works.
M3/4
255/35/19 (661mm)
275/35/19 (675mm)
14mm 2% difference
M3/4 ZCP
265/30/20 (dia 667mm)
285/30/20 (dia 679mm)
12mm 2% difference
M4 GTS and CS (Cup 2)
265/35/19 (dia 668mm)
285/30/20 (dia 679mm)
11mm 2% difference
M3/4 CS
255/35/19 (dia 661mm)
285/30/20 (dia 679mm)
18mm 3% difference
265/30/19 (642mm) will be 37mm 6% different than 285/30/20. This combo will not work and there is no reason for BMW to select this combo.