John is right, those two pictures are the "EVIL" split rims, the ones to get rid of and not play with.
These are also the "EVIL" ones:
http://www.stovebolt.com/techtips/GRIGG/8.jpghttp://www.stovebolt.com/techtips/GRIGG/7.jpgSome more info about these wheels:
These wheels should be avoided. The rim made of two nearly identical haves, actually comes apart in the center. These wheels are hard to identify because you can’t really see how they are made while assembled. It’s easier to identify them by eliminating the other possible wheel types. They are not "Locking Ring," "2-Piece" or "3-Piece Wheels" because they don’t have an easily identifiable ring or rings on one side (lip) of the wheel. They are not singe piece tubeless wheels because they do not have a dropped center (where the tire bead goes to allow you to work it over the rim for instillation or removal). Again, wheels split in the very middle should be avoided, don’t even try to put air in one that is low.
Grigg