Regarding the speed, I've ridden track bikes at the USOC track occasionally when I was racing in college. On a cement track, you do not need to ride very fast to stay up on the bank, even very high on the bank. When riding slow (and you can ride VERY slow), the bike will be very upright. It also appears that the crank arms are short to accomodate the angle (hitting a pedal on the bank is a good way to get some road rash).
If you've ever ridden a track bike, you'd also know that most of the riders will end up looking in the same direction on the turns at slow speed. They all look into to the turn. As it seems they're stunt riders, they all appear to be looking at the rider ahead or across from themselves to ensure pace. This is the expected position.
As for the spokes, if they're riding at just a couple miles per hour, I'm sure there is a shutter speed at which the spokes will not appear to move. After all, you've got to get into the 1/250 range to get good motion blur in race car wheels when panning, and they're going a whole lot faster than 1 or 2 miles per hour.
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