So when they started offering the flat free tire for wheel barrows and other units, I replaced any tire that flattened with new flat free tires all around. What about automobile and truck tires. This pneumatic tire racket is quite lucrative for the industry. Makes me broke replacing all 4 tires, balance and re-adjusting the front end every other year.
They have them... But they are expensive. To the comment below... You can mix chemicals to make the rubber wear like steel and last 300,000 miles. But they would have no grip! The more grip a tire has (think sticky, high performance) the faster it wears out.
It is a huge pain to have a flat on the wheel barrow just when you need it most!
That and tires could be made to last longer with some chemical tweaking it seems. Planned obsolescence.