SIT is an integral tire component that uses atmospheric air to automatically inflate the tire while it is used. This ensures maintenance-free, constant tire pressure over the lifetime of the tire.

Sounds like magic to me. How long until the magic item that is constantly adding pressure to said tire runs out of air? And how would you know that it was out? (A flat tire?)

Don't get me wrong. Anything that keeps tire pressure constant is absolutely wonderful, even if it eventually runs out. I would love to have this on my car, and it ultimately would be great for the environment if we all had it. I am just trying to understand at what point this new feature would fail, and how we would know.