It's friggin sweet. I am trying to build one.. but needs tones of steel.
The contact point for the tire in on a barrel (drumb) similar to a dyno.
A dyno drumb is about a 1000 pounds, so I assume this would be right around the same to replicate wheel to road resistance...
It needs a rear axel or something to secure the back wheel while still allowing it to spin. Teather the front tire and rock a roll.