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      10-24-2012, 12:42 PM   #12
Mahlzeit
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EC-7s aesthetic design likely requires more material.

ARC-8 is modelled after the ancient BBS RC wheel design from the 90's. Folks w/ dual street/track aspirations likely wanted an updated look - ala M3 competition wheels.

In general, I believe the more concave a wheel, the more material your need - for a given stress rating, material and manufacturing process.

I'm no wheel engineer - just assembling my observations.