Don't know about other car types, but in my experience there is a friction fit dust cap on the front drum or rotor. An obvious attachment point assuming the bolt is heavy enough to take the repeated whacks it takes to seat the dust cap. The speedometer is driven by a square hole in the left dust cap, but you always wanted a GPS speedo anyways.
I don't like the idea. I'd rather see skateboard wheels on the front and back of the skirt that bear on the side of the tread (instead of the sidewall).
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