On 4/28/2016 8:22 AM, Stormin Mormon wrote:
On 4/28/2016 8:11 AM, Frank wrote:
I know it is an old concept. Air would still leak out as tire is under
pressure and air would still permeate rubber needing occasional
replenishment.

The foam hardens when dry. As such, it seems like
it would fill the tire and be rigid. No inflating
needed, due to the rigid, hard foam.

Tires need to flex. Foams are not that ridged but would need to recover
from flexing. Stiffer foams would not recover as well.