choddo

cm^3 might even cancel out once divided by area and thickness so ok.

You'd have to get the tube to full pressure instantly for your example to be a test of this hypothesis. Air will always escape easily from an uninflated tube inside a tyre. Also it only reduces the rate, doesn’t stop it. How often do you want to re-inflate it?

Arthur Peabody

I have often inflated tubes with punctures to 100 psi. They lose all that pressure in a few hours, not 40 days, as they would through permation through the tube alone.

Troul 

maybe you could soak the tube in a tubeless sealant bath to reduce the time to which it losses air?

FBinNY 

I'm sorry to seem like an adzhole here, but, what is the point of this thread???

The OP offers a calculation whose results match his actual experience, then invites debate. About what?

He mentions that he might be wrong and wants to learn. But he argues with every response.

Later he mentions getting frequent punctures, but that has no relevance to his original question.

Please OP, spare us the runaround, what EXACTLY are you trying to figure out?

choddo

Actually, forget I said anything.

Arthur Peabody

Whether I have made any mistakes. Someone else could have made the same calculation I did, figured out how s/he had made an error. Rarely does experience match theoretical calculations. I know my tubes have non-uniform thickness because they bulge differentially when I inflate them to search for leaks. Because thickness is in the denominator, an average doesn't capture experience. Responders had a wide variety of air loss, which was useful.

It's a forum: a place for argument. Have you not read Plato? Some responses were so different from my experience I responded with argument. Can you not inflate a tube with a small puncture to 100 psi (inside a mounted tire, of course) and have it lose air much faster than permeation? Do tubes seal to tires when inflated, block movement of air out of the tube other than permeating the tire?

It related to some responses.

Nothing. I asked in case someone had made a similar calculation.

You have to think of that first.

I wasn't asking how to reduce air loss, doubt this would work.

choddo

I didn’t mean forget I said anything at all. It wasn’t some sort of admission I was wrong so your “should have thought of that first” is not the first time you’ve misinterpreted what anyone outside your own head is saying.

I meant anything which I had written in that last post, because I decided you aren’t willing to listen so I’m not going to waste any more of my time or yours so edited it out.

Troul 

i doubt your doubts that in doubt it could be an experiment.

ign1te

Are you the tight headset guy?

Arthur Peabody

No.