easy_rider911 said:
Thanks for the explanation

No problem, I hope I'm remembering correctly... .

That membrane they have to put in tires to slow seepage of air? (Rubber is apparently very porous, like a baloon) Why can't they just change the material so ZERO air leaks out? Seems like they've had enough time to develop something cheaply... .

Imagine "never" having to check your tire pressures because you "know" there's no valve damage and no nail holes.