i personally went with the csl sizes, if its good enough for the track biased csl then its good enough for the z4m imo. plus if you feel round the back of the wheel on the rears you'll be amazed how tight it is, personally im very happy with 235/35/19 265/30/19.
im currently needing to change to new tyres and ill be using the same sizes again but maybe ps2s with the larger sidewall.
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