Was reading an article on
A Brilliant View Into Aerodynamics - Speedhunters.
It struck me as odd and possibly contradictory that the images actually seem to recommend having an open area right behind the tire (virtually no fairing), as opposed to a fairing directly behind it gradually sloping inwards. Even though, obviously, those designs still push/keep air away from the front and sides of the tires.
Any ideas how/why this works or why, in comparison, having a fairing directly behind the wheels may prove better aerodynamically?