The "8 ways" tire thread sparked thisquestion, butr I felt it better belonged here.
Why don't they make tires out of polyurethane? Creature comfort? Or is there a scientific reason?
They are currently under developement
I see an article in the making on this stuff. They have really great info on rubber vs. polyurethane. I just jetted of a request to republish it. Super great info. If not, with a little research . . .