The wheels have a twist in order to give the car a feeling of motion when stationary. They aren't symmetrical because it would increase production cost, and it's really hard to see the left and right side of a car at the same time.
A lot of manufacturers, even Porsche, have done wheels with a directional pattern, a la Porsche twist or Honda GSR blades, but most do not make a left and right side specific pattern.
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