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CO2 Cartridge Size(14 posts)

CO2 Cartridge Sizeshockcord
Jun 23, 2003 7:45 PM
I'm interested in getting a CO2 inflator and am wondering what size CO2 cartridge to use for 700x23 tires?
re: CO2 Cartridge Sizerussw19
Jun 23, 2003 8:03 PM
12 gram cartridges will get your tires to around 65 psi. It's enough to ride home. 16 gram cartridges will get you closer to 100 psi. Some shops don't even charge a different price for the two so get the 16 gram ones.

Jury's out-filtersweep
Jun 23, 2003 9:06 PM
I just purchased a Crank Bros mini pump for my wife- and that thing is LIGHTER than a CO2 and two cartridges (and anything less than 2 is flirting with disaster) AND you can use it again and again. Your arms may look like Popeye's after inflating a few tires, but there is less of the 'one-try-to-get-it-right' feeling.

CO2 is definitely quicker and easier- but what is your motive for using it?

You may have already considered all that- but if not, it is something to think about- BTW- that pump fits in the BOTTOM of a jersey pocket- unlike the bozo on the club ride a week ago with a regular mini pump that flew out during the ride...
It would have been funny if it ended up in his own spokes....russw19
Jun 23, 2003 9:24 PM
Oh and one other thing to consider if you are going to use a CO2 cartridge. You can always get the kind of valve that allows you to start and stop.. the kind with a trigger valve, and a 25 gram cartridge. That way if you flat twice, you have enough to CO2 to fix you up (assuming you have another tube or patch kit.)

But there are some really good and really small minoi-pumps out there now too.

Nobody waited around for him-filtersweep
Jun 24, 2003 4:42 AM
He went back to pick it up and we never saw him again...

Serfas (and others) makes a dual CO2 pump that takes both threaded and unthreaded (or is it NON threaded?) cartridges- and it has a trigger. I don't know how long the CO2 would stay in an opened cartridge... but theoretically, it should stay in a threaded one for at least the rest of the ride.
re: CO2 Cartridge SizeSteve Bailey
Jun 24, 2003 3:58 AM
Carry a pump just in case,, then use it to partly inflate and/or put in the first 40 psi, then top off with a 12g CO2.

You can buy bulk 12g CO2 at Wallmart / Kmart / Sports Authority a whole lot cheaper then what they sell them LBS or mailorder.

Hmmm....Gregory Taylor
Jun 24, 2003 6:25 AM
A couple of thoughts:

* I normally get about 85 - 90 lbs. from a 12 oz. CO2 cartridge for a 700 x 23c tire.

* Our local LBS sells a pack of 12 oz. cartridges for $7.50. This is an atrocity. The 12 oz. cartridges can be had very cheaply at stores like Walmart -- I bought a box of 15 for about $9. Go back to where they sell the pellet and bb guns.

* I use the CO2 when I'm on a group ride, and I can be fairly sure that there will be someone with a mini-pump around if the CO2 inflator craps out. I had one crap out a couple of years ago -- it can happen. If I'm going solo and will be in a place where walking home isn't a convenient option, I take the mini-pump.

* I really wouldn't put a semi-discharged CO2 inflator in a jersey pocket. Think of that thing bouncing around in your pocket. Think of how it would feel on your back if it went off.
Listen to a flat expertUncle Tim
Jun 24, 2003 6:26 AM
I've ridden many long distance rides. The vast, vast majority of those rides go off without a hitch. But, there is that time when I've had some inexplicable and frustrating bouts with flats caused by what appears to be, well, nothing. I have advice for you.

CO2 is the way to go. A 16g cartridge (threaded)will crank the tire (700x23)up to around 120 psi. That's what you need. Carry one or two of those.

The smaller unthreaded cartridges will get the tire up to around 100psi, which isn't bad. You can ride strong without bouncing. Have a couple of those, too, and make sure you have a system that can deal with both cartridge types.

Carry at least one tube and one patch kit and you should be covered for rides of 60 miles or less.

For longer rides (centuries, brevets), you're gonna need some backup. That's because, one day, you will have a Day of Flats. It happens. A Force of Nature thing. Don't fight it. Carry a pump (frame or mini) in case you use all your CO2. Of course, you can always find a riding partner who carries a frame or mini-pump.

The pump afficianados shy away from CO2 because they fear something could go wrong. Well, CO2 can go wrong. But a pump can go wrong, too. I've seen things go wrong with them, too. Anything can happen out there.

CO2 will cover 98% of your flat tire situations with ease. A frame pump will cover 99% of your flat tire situations, but without ease.

Co2 is for you.
how hard is it to pump up a tire?ColnagoFE
Jun 24, 2003 6:57 AM
With my Zefal HPX I can be over 100 PSI in under 100 strokes. Unless you are racing or get tons of flats I don't see this as a big deal.
how hard is it to pump up a tire?Uncle Tim
Jun 24, 2003 1:04 PM
It's not hard to pump up a single tire with a frame pump or even with a mini-pump. But let's say you've ridden 90 hilly miles, it's 95 degrees and there's precious little shade to be found. In conditions like these, pumping up a tire can be harder than riding.

CO2 is just quick and easy.

Yes, the CO2 system _could_ fail. But, as I've said before, pumps can fail, too. Some impatient pumpers have been known to even break a valve occasionally.
full disclosureColnagoFE
Jun 24, 2003 1:38 PM
I nearly had a long walk back to town after blowing a C02 trying to innflate a tire and not having a frame pump as a backup. Since then I don't go anywhere without my Zefal HPX and am a bit jaded on the C02 experience. I'll use mine for racing only now.
Listen to a flat expertlitesp
Jun 24, 2003 8:27 AM
I am considering going to C02 but would still like the reassurance of a pump. I don't really want to carry too many extras. What do you think of the C02/mini-pump combos such as Innovations Second Wind?
Looks like a good system...Uncle Tim
Jun 24, 2003 1:08 PM
I have no qualms saying that this particular model would be a good CO2 system.

The built in mini-pump appears to serve as a workable back-up, but when push comes to shove, I'd wager a good sum that it takes a lot of work to get a tire up to good pressure.

Go with it and see if it works for you.
re: CO2 Cartridge SizeGregJ
Jun 24, 2003 7:06 AM
I have been using the cheap 12 g cartridges for a few years. I think they work great. I get at least 90 psi in a 700x23 tire. It is perfectly suitable for getting me through the rest of my ride. There is no need to use 2 cartridges or pump the tire first or anything. If you are a really heavy rider, 90 psi may be a little on the low side but it should be fine for most people.