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Those rims make some sense. With the tire in front, the dimples make no difference, since any tread, and the tire-rim interface are boundary-layer turbulators. At the back of the wheel, with the rim leading, the thicker boundary layer may close easier behind the rounded tire shape. Maybe. There is still turbulence from other leading parts to do that job much of the time in the real world. And dimples can work to confuse both customers and competition, if not the producer as well. Bicyle riders are also notorious for riding faster if they only think that new parts are helping.
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