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Frank, that was my opinion, not fact. My point was that you don't want to add frontal area by adding a big outward bulge to your wheels if they already sit at or outside the fenders. I agree that the convex shape is inherently better for aero on a wheel itself.
Furthermore, we are talking about these things like they have a smooth curvature to them. But I'm willing to bet these pans just have a harsh step on the rim like every other pizza pan. So you either have a flat wheel cover that sits a 1/2" outside the rim lip or a 1/2" inside. Is the small region of turbulence caused from placing them inwards worse than the added frontal area of placing the pan convex?
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