The tire started tubeless, and we are now back to the tubeless tire.
From the theatlantic.com
The bead seats tightly against the two rims on the wheel to ensure that a tubeless tire holds air without leakage.
From the en.wikipedia.org
In 1903, Paul Weeks Litchfield is granted a patent for the first tubeless automobile tire.
From the en.wikipedia.org
The rubber in valve stems eventually degrades, and, in the case of tubeless tires, replacement of the valve stem at regular intervals or with tire replacement reduces the chance of failure.