Nobody warned me..
03-19-09, 06:13 PM
#76
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I think the Red Zeppelin is what you are looking for. That's what I've been using for a while. It even has a foam-like cover so there's no issue with frozen fingers like the OP was talking about.
[IM G]https://ecom1.planetbike.com/planetbike/media/1019.jpg[/IMG]
[IM G]https://ecom1.planetbike.com/planetbike/media/1019.jpg[/IMG]
03-19-09, 07:24 PM
#77
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03-19-09, 10:02 PM
#78
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Actually it does explain it, but you have to show before & after conditions:
PV=nRT ; we can remove nR since they'll be the same before & after if we don't leak through the seals
P1V1 = T1 and P2V2 = T2 for before & after conditions
T2 = T1(V1/V2)(P2/P1)
Unfortunate this only assumes an "ideal gas" consisting of particles with zero volume without any molecular interactions. In real life at 25c, CO2 would be a liquid in that cartridge since you can only store about it compressed up to 850psi. Above that it will start to liquidify.
PV=nRT ; we can remove nR since they'll be the same before & after if we don't leak through the seals
P1V1 = T1 and P2V2 = T2 for before & after conditions
T2 = T1(V1/V2)(P2/P1)
Unfortunate this only assumes an "ideal gas" consisting of particles with zero volume without any molecular interactions. In real life at 25c, CO2 would be a liquid in that cartridge since you can only store about it compressed up to 850psi. Above that it will start to liquidify.
https://en.wikipedia.org/wiki/Joule-Thomson_effect
03-19-09, 10:19 PM
#79
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CO2 is also recovered as a by-product in the production of hydrogen.
There is also naturally occurring CO2 that is "mined" with wells.
You could look at using CO2 filling up your tubes as somewhat planet friendly since it would otherwise be vented to the atmosphere.
03-19-09, 11:29 PM
#80
Senior Member
The CO2 will always eventually make it into the atmosphere. Where do you think it goes after it's released from the cartridge into your tire? The ungreen part of it is the energy it takes to fill the cartridges, and the energy and material it takes to create, distribute, and, if the rider is conscientious, collect and recycle or refill the cartridge.
Don't fool yourself into thinking you are somehow doing the environment a favor by using CO2 cartridges. There is no way it's a net good. The frame or mini pump that you keep in service for many years is the most ecological way of filling your tires on the road.
Don't fool yourself into thinking you are somehow doing the environment a favor by using CO2 cartridges. There is no way it's a net good. The frame or mini pump that you keep in service for many years is the most ecological way of filling your tires on the road.
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"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --the tiniest sprinter
Last edited by Brian Ratliff; 03-19-09 at 11:34 PM.
03-19-09, 11:51 PM
#81
It's ALL base...
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I'm not sure you quite get it, when I pulled the thing off my glove, parts of the leather palm came off, stuck to the cartridge. If I'd have been bare handed it would have been chunks of my skin. I'm all for riding through the pain and such but I'm really not into mid ride skin grafts. 
I still think it had to do with the dewpoint / temp spread and the fact I was wet from the rain. (Oh and all that Physics stuff too)
I still think it had to do with the dewpoint / temp spread and the fact I was wet from the rain. (Oh and all that Physics stuff too)
https://www.bikeforums.net/showpost.p...2&postcount=32
Ah-ha somebody who actually read my posts! What you describe was my intention but pushing it up against the valve stem didn't cause it to release the air. The only way I could get air to flow was to pull up / down on the sprung ring. I'm going to have to practice with a few of them Friday.
03-20-09, 12:02 AM
#82
Look at all these buttons
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I'm not sure you quite get it, when I pulled the thing off my glove, parts of the leather palm came off, stuck to the cartridge. If I'd have been bare handed it would have been chunks of my skin. I'm all for riding through the pain and such but I'm really not into mid ride skin grafts. I still think it had to do with the dewpoint / temp spread and the fact I was wet from the rain. (Oh and all that Physics stuff too)
I still think it had to do with the dewpoint / temp spread and the fact I was wet from the rain. (Oh and all that Physics stuff too)My point was that people were complaining about something that solves this problem being too bulky. Its like... what do you want? Frozen hands, or an extra ounce of weight? Changing tires isn't a fashion show.
03-20-09, 02:52 PM
#85
Hills hurt.. Couches kill
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03-20-09, 04:43 PM
#86
Tęte de Limace
One thing I wasn't warned about, but should've figured out on my own... for road tires, especially something like 25c or bigger, you have to put the wheel back on before inflating the tire. This was potentially a hard lesson learned the first time I had to use one out on the road. Thankfully I had an extra one on me, or I would've been SOL.
03-20-09, 06:47 PM
#87
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One thing I wasn't warned about, but should've figured out on my own... for road tires, especially something like 25c or bigger, you have to put the wheel back on before inflating the tire. This was potentially a hard lesson learned the first time I had to use one out on the road. Thankfully I had an extra one on me, or I would've been SOL.
03-20-09, 07:28 PM
#89
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Ideal gas law PV =nRT has nothing to do with the Joule-Thompson cooling effect (and no they don't make seatposts).
This is why we will be soon completely owned by other countries.
I'm in snitty mode today...
This is why we will be soon completely owned by other countries.
I'm in snitty mode today...
03-21-09, 07:51 AM
#90
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Regarding the envirnonment, you're dumping 60g of CO2 into the air for every mile you drive... I'd say the CO2 in a 16g cartridge is not that significant.
03-21-09, 08:09 AM
#91
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Oh, and another lesson learned: make sure your valve stems are long enough.
A rear flat on the way to a group ride at o'dark-thirty is not the time to find out the tubes you bought have long enough stems to engage the CO2 chuck on the slightly shorter front rim, but are just a wee too short to engage the CO2 chuck on the slightly taller rear rim.
Sub-lesson: if the stem won't engage the chuck with the first cartridge, it's not going to work with the second, either.
Most important lesson in this particular session at flat-school: even a slow-head like me is smart enough to bring a mini-pump as a back up.
A rear flat on the way to a group ride at o'dark-thirty is not the time to find out the tubes you bought have long enough stems to engage the CO2 chuck on the slightly shorter front rim, but are just a wee too short to engage the CO2 chuck on the slightly taller rear rim.
Sub-lesson: if the stem won't engage the chuck with the first cartridge, it's not going to work with the second, either.
Most important lesson in this particular session at flat-school: even a slow-head like me is smart enough to bring a mini-pump as a back up.
