I go in with an open mind, but there were a few red flags for me:

• they keep confusing “tires” and “wheels” on that KS page. You know the difference, right? Why don’t they?
• they repeat that NASA design bit over and over, and even provide a link to a NASA web site but the tire shown there is very different from the design in the KS. I fear that the economics of the NASA design would never work out in the marketplace, but that’s not stopping them from pushing this sale.
• as someone else pointed out, they claim the re-treading process would be cheap and easy, without saying how it’s done or even who will do that.

Also, there have been quite a few previous inventions which claim to improve upon mostly rubber, air-filled tires. None of them made enough economic sense to replace what we’ve had going for many, many years. I’ll be happy to learn I am wrong and this company can really do that, but starting at $500 for two tires seems like a bad start to me. We will see…