What kind of fixed calipers?
From my experience on my E46, there is a significant difference between the OE euro floating rotor and the Stoptech Aero Rotor. The ST rotor just lasts a lot longer. The OE floaters wore pretty well but I had to replace because of heat cracking after 2 sets of pads.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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