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the reason the lighter wheel is usually less aerodynamic is because they have more holes in them which allows air in to cause drag, this would be combated by either wheel skirts or flat covers (yep kill the cool effect)
out of curiosity have you seen the list of lrr tires, you may want to check into those.
so yes the first 3 points are accurate generalities with number 4 almost always being true (if i understand though there is a point of diminishing returns)
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