Michelin Tweel...?

[Highlander]

What do you think...?

[Barklessdog]

I dont know why they have not done it before (not run flat tires)

[jmcgliss]

For use in snow and mud, they'll need to solve both wheel balance and the throwing off of debris at highway speeds.  Imagine a blender running with the lid off.   

[Dave W]

This is a three year old clip. Why haven't we heard more? I suspect because it's a long way from becoming practical.