There was a post about these things quite awhile ago.
http://www.wheelman.com.au/
My Neighbor just got one off Ebay, and let me tell you, that thing is hard as crap to ride! I tried for about 15 minutes, and the furthest I got was about 15'.
He can ride it pretty well, but its crazy hard to balance on. I'll try and get some pictures of it, but no promises
I DID however figure out how the wheels work. Its basically a Super strong rim that comes in and is rounded on the inside, kind of like a Mavic disc rim. There are 4 rollers that are molded to the shape of the rim and support the wheel and keep it in its place. The drive mechinism is also really interesting. It sits right on the outside of the backwheel and has a wheel with bars that get inbetween the treads and drives it by the tread. Its kinda hard to explain, I'll try and think of a better way.
Anyway, the thing is pretty cool, and he got it for $350 off Ebay.
http://www.wheelman.com.au/
My Neighbor just got one off Ebay, and let me tell you, that thing is hard as crap to ride! I tried for about 15 minutes, and the furthest I got was about 15'.
He can ride it pretty well, but its crazy hard to balance on. I'll try and get some pictures of it, but no promises
I DID however figure out how the wheels work. Its basically a Super strong rim that comes in and is rounded on the inside, kind of like a Mavic disc rim. There are 4 rollers that are molded to the shape of the rim and support the wheel and keep it in its place. The drive mechinism is also really interesting. It sits right on the outside of the backwheel and has a wheel with bars that get inbetween the treads and drives it by the tread. Its kinda hard to explain, I'll try and think of a better way.
Anyway, the thing is pretty cool, and he got it for $350 off Ebay.