Got mine done a few weeks ago in satin black, paint not powder coat. Wasn't sure at first, but really happy with how it turned out. Efficiency is identical to my 18" aero rims (no hub caps) per my trip computer after 1,000+ miles of driving already. Also I cannot tell a difference in ride quality or noise vs the 18" aeros. In fact part of me wants to say the 19" rims feel and sound better, but the Conti's could also just be better tires than the Michelin MXM4's.
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