Quote:
Originally Posted by Expert@ApexRaceParts
Proctor750 is correct. Because of the concave design of the ARC-8 face, caliper clearance becomes an issue. With the size of the rotors and calipers, the barrel clearance would be so tight that you'd risk damage if a pebble were to get stuck between the caliper and the barrel. The EC-7 was designed with brake clearance as the priority, making it the perfect choice for the M2C. 
--Dylan
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It's too bad that BMW didn't think of that. My 788M front wheels both have grooves from rocks getting stuck between the calipers and the barrel.