Every single time I think to check my air pressure, or even look at my rear wheels, not one but BOTH tire valves are up under the skirts?
About 1/2 of the wheel is showing, so probability would dictate that nearly all the time, at least one valve should be below the skirt. But OHHHH NOOOOOO, not for me!
And I though that they used the same technology of the Klingons in Star Treck:
They are cloaked and appears when they see it fit, being after turning the wheel by half a turn or so.