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Old 05-04-03, 03:54 PM   #1
Chi
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What size CO2 cartridges?

I know there are different sizes, so what size is the most appropriate and economical choice? Would a 12g cartridge work, or do I need a 16g?
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Old 05-04-03, 03:59 PM   #2
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whatever fits your bag best Either one will work fine
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Old 05-04-03, 04:03 PM   #3
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Sweet! Picked up a 15 pack of 12g's for $8 at Walmart.
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Old 05-04-03, 04:07 PM   #4
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Be advised that it may take as many as 3 of those 12g cartridges to pump a mountain bike tire up to a decent pressure.

I use one 12g cartridge on a road bike tire and get about 90 psi out of it. On my mtb I figure three of the same cartridges will give me 45 psi or so. Maybe you could limp home on 2 cartridges worth of gas.
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Old 05-04-03, 04:10 PM   #5
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So even if I had 16g cartridges, I'd still need about 2 of those?
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Old 05-04-03, 04:26 PM   #6
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3? Jeez, when i was riding awhile ago i had a total flat, i put in a 12g cartridge of air and had plenty of air to make it back home, of course by the time i made it back it was totally flat again but oh well!
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Old 05-04-03, 04:42 PM   #7
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Ok found this on the Performance website:

Tire inflation capacities: 700x23-94PSI. 700x28- 90PSI. 26x1.5- 41PSI. 26x1.95- 32PSI. 26x2.125-28PSI.

So I guess we can limp home on one.
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Old 05-04-03, 04:47 PM   #8
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I trust my trusty pump.. Only use I'd have for co2 cartridge, as a spare to a spare.
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Old 05-04-03, 05:30 PM   #9
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If you do use CO2 Cartridges to fill your tire, when you get home be sure to deflate it, and re-inflate the tire with a regular tire pump. (CO2 apparently leaks much faster through the tube wall than regular air does). Go figure...
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Old 05-04-03, 06:09 PM   #10
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I used to think that way Cyclezealot then I picked up one on sale, I love them now I carry 4 Co2 cartridges with me, I figure that should get me home unlesss I have EXTREMELY bad luck.
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Old 05-04-03, 06:17 PM   #11
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Chi,

I pick up a box of 12gram cartridges now and then at Wally world for real cheap and use them in my CO2 pump. I've found that one will give the tire enough pressure to get home on. I usually ride with one in the pump and one to two in the seat bag with it. On longer rides, I carry a manual pump on the bike in case I run out.

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Old 05-04-03, 06:20 PM   #12
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Thanks for the responses and tips everyone! Learn something new everyday.
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Old 05-05-03, 09:50 AM   #13
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The Innovations Big Air canister works well for mountain bikes, as it fills two 26" tires, so even if you have some problems, it ought to at least fill one completely. It is about the size of two 12 or 16 gram CO2 cartridges. It only works on threaded inflators though, so that might be an issue for some.
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Old 05-05-03, 10:04 AM   #14
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Quote:
Originally posted by Cipher
If you do use CO2 Cartridges to fill your tire, when you get home be sure to deflate it, and re-inflate the tire with a regular tire pump. (CO2 apparently leaks much faster through the tube wall than regular air does).


Any scientific references for this?
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Old 05-05-03, 10:07 AM   #15
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Quote:
Originally posted by Chi
I know there are different sizes, so what size is the most appropriate and economical choice? Would a 12g cartridge work, or do I need a 16g?

Depends on price.


One 16g canister fills my 700x28 tyre quite nicely, certainly enough for a safe journey home.

I take a second, just in case. But how often am I gonna get a flat?
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Old 05-05-03, 01:02 PM   #16
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Just got a flat 2 days ago on a San Francisco Golden Gate ride. Couldn't commute this morning coz I didn't catch it till today ... had to drive.
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Old 05-05-03, 02:45 PM   #17
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FYI - kmart carries 12g carts by the case - I forget what I paid but it was like $.30 each (it's not on their website you have to go there)
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Old 05-05-03, 02:56 PM   #18
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I know I bought a 25 pack of them last time at wallmart for $12 for teh 12 gram Co2, not found any place that sells 16g by the case yet.
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Old 05-05-03, 03:04 PM   #19
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Quote:
Originally posted by belfast-biker
Any scientific references for this?
Paraphrased from another post a guy made on another cycling website... (I have no personal experience with this. The one time I've used a CO2 cartridge to inflate a flat, I had to add some air with a pump when I got home because I was under inflated on one 12g. cartridge).

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Old 05-05-03, 06:38 PM   #20
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I use the 12 gram one because they're cheap and easily available.
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Old 05-05-03, 07:00 PM   #21
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12gram threadless are easy to find anywhere.. if you are out on the road bug a starbucks they even have them
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Old 05-05-03, 10:10 PM   #22
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Really?
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Old 05-05-03, 10:33 PM   #23
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Star bucks uses them for their whip cream can things.. not sure of exact name.. THey don't actualy sell them, but if desperate I'm sure they would give you one.
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Old 05-05-03, 10:34 PM   #24
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It's not CO2 but nitrous oxide I believe. It would still do essentially the same thing. Except you could inhale the nitrous and get a fuzzy head
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Old 05-06-03, 12:03 AM   #25
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