I am not nearly the researcher that other on this forum are...
One design I saw was from the 20s or early 30s and I believe it was french. I saw a newsreel type short of a guy on a seat on a small gasoline motor, kind of like a rear engine lawn tractor. The whole thing was in a large wheel, about 8 or 9 feet in diameter. This film had him rolling along under power, and turning by leaning the whole thing... I do not know about stopping. It was a typical clip from a movie like, "Those incredible men in their wacky machines..." Try this link...
http://www.dself.dsl.pipex.com/MUSEUM/TRANSPORT/motorwhl/motorwhl.htm#gd
Another design was in a cartoon, where there was a truck sized tire, and the entire interior was the cabin, and there was a plexi glass style bubble on either side which allowed for more room inside, and for the pilot to see. It was a cartoon, and tho it showed it moving, I do not know if there was a working prototype, or just an idea... I also now recall seeing something more like this in real life... try this link on for size...
http://www.gizmag.com/go/4506/
Lastly, I thought I saw another one, similar to the first listed here, but far more recent, like the 70s or 80s or maybe even later... I recall the image, but cannot recall much else... This idea on the link should give you something to think about!
http://www.theriotwheel.com/index.html
I went back and edited my post, and added links. They do not exactly match up with my narative, but are worth the look...