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the miracle of reinflation?

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

the miracle of reinflation?

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Old 07-13-15, 11:47 AM
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RVARider
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the miracle of reinflation?

Friday I went riding and got 9 miles into a 15 mile ride and got a rear flat. Could not find anything obvious. Pumped up the tube twice and it deflated both times. When I got home I used my larger pump and filled it to 120psi. Next morning it was still at 120. Went riding 22 miles, fully expecting to replace the tube during the ride. It never deflated - nor did it on Sunday's 23 mile ride. the valve was hand tightened, no cap, so how does this happen?
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Old 07-13-15, 11:59 AM
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hairnet
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Old 07-13-15, 12:41 PM
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Johnny Rad
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You're still going to change out or repair that tube, right?

You're officially on borrowed time.
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Old 07-13-15, 12:43 PM
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How did you get home Friday?
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Old 07-13-15, 01:40 PM
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My guess: There's a hole in your tube. When you inflated it on the ride, it deflated again due to a hole, as tubes do.

When you inflated it at home and set it up, the rubber of the tube has made consistent contact with the rubber of your tire and without the rolling stress to open to hole or create a gap, no air has been lost. 120 is high psi. It can hold stuff together. The New York water mains for instance are only held together because of the high pressure inside them [citation needed], but don't think too heavily on that.

After sitting there for a bit, there's a bit of "stick" in the rubber that's holding it in place. If you start rolling on it again, it shouldn't take long until it starts losing pressure again.
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Old 07-13-15, 01:41 PM
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my wife had the car at the state park and was heading home - she picked me up since she was driving that way - would have changed out the tube if she wasn't so close
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Old 07-13-15, 01:45 PM
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were you high?
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Old 07-13-15, 01:54 PM
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Your floor pump uses bigger air molecules than your portable pump

Probably leaking out of the valve and a few fills moved it enough to seal 100% again. If i suspect that on one of my bikes, I put a little spit on the valve to see if it bubbles.

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Old 07-13-15, 02:02 PM
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Originally Posted by Number400 View Post
Probably leaking out of the valve and a few fills moved it enough to seal 100% again. If i suspect that on one of my bikes, I put a little spit on the valve to see if it bubbles.
I was thinking the valve too..
I often spit on schrader valves... just to see, but rarely find them leaking

50 miles would be a lot of miles to put on a tire with a hole and some mystery seal.

Do you use some kind of a tire sealant in your tubes?
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Old 07-13-15, 02:11 PM
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Originally Posted by bt View Post
were you high?
Everyone was; sitting 'round a campfire in the Rocky Mountains.
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Old 07-13-15, 09:47 PM
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If it's not the valve, then lick the tire and look for bubbles. Yeah, the whole tire...
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Old 07-13-15, 10:17 PM
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Not that miraculous-

people reinflate their tires with floor pumps all the time.
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Old 07-13-15, 10:55 PM
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Originally Posted by hairnet View Post
Yep. Sounds like a case for the X-Files. I suggest contacting Special Agent Mulder.
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Old 07-14-15, 04:57 AM
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I am an airline pilot, and stuff like that happens all the time to our planes. No sense wasting precious time on the ground trying to fix something that might fix itself.

We just run'em and hope for the best.
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