I would think that with BMW's rear bias, the rears will wear faster and you would be ok replacing two rear tires vs all 4 depending on wear...especially on M Sports with 80/20 rear bias.
I learned firsthand that in situations in which you have a single tire failure (under their protection plan) and two or four tires are recommended, America's tire can give you $25-50 credit per good tire towards new tires...better than nothing.
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Past: E36 325i, E39 540i, F46 323i (AA tuned), E82 3.0NA, E84/F30 N20 BMS Stage 1, E70 X5 N55, F06 N55
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