these look cool http://www.brompfication.com/24-easy-wheels.html

bearing ID for front is a 6mm bolt , rear of the rack its a 5.. thats the only difference..

Be conscious that rough handling causes the J bend on the main rear assembly tube that the wheel screws into
to keep bending further.. then in breaks off. *

In reality what you may be wanting is the feature bike friday's tikit does better .

once folded they have a handle to grasp , and the front wheel is what you roll the bike on.

* there is a NL company that sells a special reinforcing piece and a repair part , for these situations .