Originally Posted by
sjanzeir
Okay, hold on - is this was the case, shouldn't any given tube be discharging faster when it's outside than installed? This is just it: at least two of the four tubes ive experienced this with will stay all nice and full for days - in one case, weeks - outside. Late last night, I put one of them in and pumped it up to 115 - yes, one hundred and fifteen - psi (Primo Comet rated at 110psi). By early this morning it was down to 25. This afternoon, I swapped it out for a brand new tube, and it, too, lost 30psi or so in a couple of hours!
Outside you have 1 or 2 PSI
Inside, you have 100+ PSI
The only reason for it to leak quickly when the tube is out of the tire is by over-inflating.
Not counting how well the tubes hold air before putting them in the tire, how well do they hold air after taking them out? Can you locate the new leak in the tubes?
It sounds like you have something causing a flat.. Those thin wires, perhaps a bad rim strip, or a piece of glass you haven't found.
Use some method to mark the valve on the tire (some people align with label or max pressure). Then when you take the tube out, inflate to 3x normal size, and find the hole in a bucket of water. Then go back and inspect the tire at about that point around the tire if on the outside, or inspect the rim if the hole is on the inside.
A cotton ball has also been suggested for finding things like those small wires. I haven't used it, but it is worth a try. Just run it around the inside of the tire and see if it snags onto something.