I've driven 20,000 miles (mostly highway and backroads) through WV with my smooth wheels, and even when towing 1200 lbs + carrying another 500 I had no sign of brake fade. The trailer didn't have any brakes either. If you're worried about brake cooling, I feel the rotors still get plenty of air from the inside of the wheel.
Besides, F1 cars use these (and paint wheels on the covers). And I imagine there braking needs are a bit more than ours.
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