Last week a lot of people looked at the NYTimes pic of Michelin's tweel and said "Why no sidewalls? That's Bad!". (I was in this group)
A lot more people said "Retards! It's an engineering cutout!"
Well, to the second group I say Get the facts before you speak"
That's a Road and Track Article. The juicy bit that vindicates me and others is
The spokes, tuned for each vehicle application, are chemically bonded to the aluminum hub for life. With no sidewalls to speak of, the Tweel certainly looks bizarre, but remember, there's no need for this tire to hold air.
I'm not always right, but it's rare that I'm wrong.