Hubless Wheel MK-I Concept Free 3D model

I was inspired by hubless ATV and decided to quickly draw up a concept. This is just a quick concept but I thought I would share my progress so far. I am designing it so It can be mounted to an R/C car using a special adapter.Render in PhotoView 360

Update 8/29/2011: Fixed the internal gears, reduced rotating mass of outer wheel/gear, other small changes.