Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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Maybe 12 hours or so. If you're planning to ride tomorrow, you'll be pumping that tire up again.
You might have to find a chemist of physicist to explain it fully, but as I understand it the concentration of co2 in the air is lower than the concentration in the tire so the co2 migrates through the inner tube trying to correct the imbalance.