Tire Pressure question
12-23-05, 11:34 AM
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Tire Pressure question
When I don't ride for a couple of days my tires lose pressure is this a common problem? I was thinking it was due to the high pressure but not sure. Appreciate any thoughts.
12-23-05, 12:04 PM
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Yup. I top my tires off at least once a week.
12-23-05, 12:28 PM
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If you're using ultralight tubes, you need to top them off every day or two. Standard weight tubes will hold their pressure for several days.
12-23-05, 12:44 PM
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I check pressure before every ride. My current tubes are have been exceptionally good at holding pressure, but I've had others that lost 5psi or so over 24 hours.
12-23-05, 12:45 PM
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Tubes will leak. Get yourself a good floor pump if you don't have one already, and you can top off both in a minute or two every couple of rides.
12-23-05, 01:06 PM
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Originally Posted by Paniolo
I check pressure before every ride. My current tubes are have been exceptionally good at holding pressure, but I've had others that lost 5psi or so over 24 hours.
Every ride.
12-23-05, 01:13 PM
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My experience has been that the heavier the tube, the better it holds air. I have some Schwalbe's on my hybrid (I run them at 60 psi) and they only lose about 5 psi a week but they weigh 146 gr. My conti race's weight about 100 gr. and I run them at 100 psi but they lose 5 psi a day.
12-23-05, 02:23 PM
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Sounds good....appreciate everybody's help and advice. Merry Christmas (or Happy Holidays, if I've offended) to all.
12-23-05, 05:46 PM
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One more thing.... if you blow your tube up with CO2 cartridges, count on filling the tire the next day. For some reason CO2 doesn't last as long as good ol' air.
I'm embarrassed to say I am a chemical engineer and for the life of me can't explain why CO2 leaks from tires faster than air. The only thing I can even think of is that filling a tire with a cartridge is done so quickly that rapid decompression triggers ice fragments into the tube that prevents the good seal you get from slowly filling with a floor pump. But that may be a stretch. If anyone has something more definitive I'd love to hear it.
Trekaholic
I'm embarrassed to say I am a chemical engineer and for the life of me can't explain why CO2 leaks from tires faster than air. The only thing I can even think of is that filling a tire with a cartridge is done so quickly that rapid decompression triggers ice fragments into the tube that prevents the good seal you get from slowly filling with a floor pump. But that may be a stretch. If anyone has something more definitive I'd love to hear it.
Trekaholic
12-23-05, 05:52 PM
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Originally Posted by oboeguy
Tubes will leak. Get yourself a good floor pump if you don't have one already, and you can top off both in a minute or two every couple of rides.
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12-23-05, 06:00 PM
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Originally Posted by Trekaholic
One more thing.... if you blow your tube up with CO2 cartridges, count on filling the tire the next day. For some reason CO2 doesn't last as long as good ol' air.
I'm embarrassed to say I am a chemical engineer and for the life of me can't explain why CO2 leaks from tires faster than air. The only thing I can even think of is that filling a tire with a cartridge is done so quickly that rapid decompression triggers ice fragments into the tube that prevents the good seal you get from slowly filling with a floor pump. But that may be a stretch. If anyone has something more definitive I'd love to hear it.
Trekaholic
I'm embarrassed to say I am a chemical engineer and for the life of me can't explain why CO2 leaks from tires faster than air. The only thing I can even think of is that filling a tire with a cartridge is done so quickly that rapid decompression triggers ice fragments into the tube that prevents the good seal you get from slowly filling with a floor pump. But that may be a stretch. If anyone has something more definitive I'd love to hear it.
Trekaholic
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12-23-05, 06:10 PM
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Originally Posted by bbattle
I believe we've covered this before and I believe it's due to the lower viscosity of carbon dioxide over oxygen and nitrogen molecules. Table here shows that yes, carbon dioxide's viscosity is lower than that of air, or oxygen or nitrogen.
just like pure hydrogen is almost impossible to contain cause the molecules slip thru anything
12-23-05, 06:44 PM
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Originally Posted by pedex
viscosity..hmm, odd way of looking at it, molecule size is what I guessed, sort of same idea I think
just like pure hydrogen is almost impossible to contain cause the molecules slip thru anything
just like pure hydrogen is almost impossible to contain cause the molecules slip thru anything
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