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Carrying CO2 cartridges inside seatpost; dumb idea?(23 posts)

Carrying CO2 cartridges inside seatpost; dumb idea?Snirp
Mar 29, 2002 11:46 AM
In the never ending quest to be lighter, I decided to give up on the large frame pump and go CO2. I also dislike bulk in my jersey pockets and large swinging seat packs. I plan to carry the filler and one cartridge in my jersey, but am looking for a place to carry a couple spares. Insufficient room prevents duct taping them to the underside of the saddle with my tire boot. Attaching them to the frame is unsightly.

Is there a reason they can't be stored inside the seat post? Could they go off inadvertently and eject the post and myself off the bike? Obviously they would have to be packed so they won't rattle around and can be removed easily. Perhaps wrapping in foam and attaching them together with a string, similar to a feminine hygiene product.

Feel free to share your experiences, thoughts and flames.

re: Carrying CO2 cartridges inside seatpost; dumb idea?RadicalRonPruitt
Mar 29, 2002 11:54 AM
As long as you have the safety engaged, it prevent this worse case scenario case. Therefore, if you place them in your seat tube, always make sure the safety is engaged. A lot like you would your rifle or handgun.
re: Carrying CO2 cartridges inside seatpost; dumb idea?grzy
Mar 29, 2002 11:59 AM
Ain't no "safety" on a CO2 cartridge, but it takes something sharp and with force to pierce the seal.
re: Carrying CO2 cartridges inside seatpost; dumb idea?RadicalRonPruitt
Mar 29, 2002 12:04 PM
I was being sarcastic. Of course their isn't a safety on a CO2 cartridge. I just can't imagine wanting to take your tire and your seattube off everytime you flatted. Not to mention if it did go off, and with how thin some of the tube are on bikes today, I really wouldn't want to take the chance. It sounds like a crazy idea to me. They make a cartridge holder that mounts to your water bottle cage.
re: Carrying CO2 cartridges inside seatpost; dumb idea?grzy
Mar 29, 2002 2:28 PM
Oh, I missed the sarcasm! ;-)

I agree it's a totally dumb idea.
Reality Checkgrzy
Mar 29, 2002 11:57 AM
They actually going to fit inside the seatpost tube? Even in the unlikely event they went off it probably wouldn't be enough to force the seat post out of the tube. They would have to overcome friction and then your weight over a relatively small area. You have a fairly large internal volume inside the frame - the seat and down tubes usually have holes into the BB shell. Then there's the whole issue of leaks where components are attached to the frame.

Once you carry a bunch of cartridges and the head you'll realize that they weigh more than the "heavy" pump. Something like a Blackburn mini pump is pretty small and light. they make holders that attach at the water bottle mounts.

The tri-guys have all sorts of holders and brackets for carrying CO2 cartridges. I can't imagine that you can't stuff them into your seat bag.

Do like a friend of mine does - he lets his wife carry the pump since she's always behind him. Nice guy huh?
re: Carrying CO2 cartridges inside seatpost; dumb idea?brider
Mar 29, 2002 12:04 PM
By training a little more and/or smarter, and paying close attention to your diet, you could probably lose more weight off your body than the pump, CO2 cartirdges, extras, and hed combined in a couple weeks. This is just a case of more money than dedication or willpower. And WHY do those tri-guys carry those CO2s? Not because of the weight, but because they're on their own to change a flat, and want to fill it up ASAP.
Eureka! You've just invented an ejection seat for bikesSlipstream
Mar 29, 2002 12:11 PM
This is perfect for when that SUV is barreling down on you. What you need to add is a 16 ga shotgun shell, a firing pin, air bag and an ergo trigger. Stuff the shell, CO2 and airbag down the tube and you in business. Make sure you patent the idea first, though. Let me know if you need a good attorney.

if only the rain would stop

ride hard; have fun; be safe ;>)
Pee Wee HermanRadicalRonPruitt
Mar 29, 2002 12:24 PM
Sorry to take the momentum away from the newly discovered inventors discussion forum, however, Pee Wee Herman's bike had an ejection seat way before the talk of ejection seats show up on this board. See Pee Wee's Big Adventure for historical documentation of this concept. I think there would be a few other tools that would be useful for the modern day road warrior riding on Ksyriums that you can find from this movie as well. If you are looking to rent it, goto
Pee Wee Herman's Super Bike with Ejector SeatRadicalRonPruitt
Mar 29, 2002 12:26 PM
Here is the image.
Pee Wee Herman's Super Bike with Ejector SeatRadicalRonPruitt
Mar 29, 2002 12:32 PM
Thanks for the thoughts, etc.Snirp
Mar 29, 2002 12:45 PM
To answer some of the questions:

I lied about it being simply a weight issue, three cartridges weigh at least as much as my pump. The pump I use is held on with velcro straps and often comes loose. I've torn a strap attaching it before. I also have to pull it on and off every ride to hang the bike on the wall or work stand. So it's an aesthetic and functional issue. I am not an obese person looking to save a couple grams. I already get the "too skinny" comments.

The cartridges are small 12g and will fit. The frame is LS Palmares Ti. Only the two spares would be placed in this spot, I'd carry one, maybe two in my jersey depending on the ride. The extras would be used for those emergency multiple flat situations. (I'm anal enough to want to be prepared.) My seatbag is too small and I don't want to change it. I may consider changing what I keep in it though. I have at least a dozen different seat bags and prefer the looks, performance and reflectivity of this sci-con one.

I also have several mini pumps, one of which attaches to the bottle cage. The holder corroded and scratched a steel mountain bike I have. Plus I hate mini pumps, or at least they hate me! The tri guy CO2 water bottle mount sounds good depending on how it attaches. I thought I receive every catalog possible, do you know who carries them?

Thanks again for the ideas and opinions. You people are great!
Spokes has themRadicalRonPruitt
Mar 29, 2002 12:51 PM
In accessories: "currently no items are for sale" ? NMSnirp
Mar 29, 2002 1:01 PM
Spokes WebsiteRadicalRonPruitt
Mar 29, 2002 1:18 PM
call them. talk with Sammy. He is a cool guy. He will set you up. Tell him Ron Pruitt asked you to call. He will give you some good deals. He is giving me a great deal on a Colnago Dream. $1850 for it and a flash fork. I am sure he will take care of you.
Thanks Radical Ron! NMSnirp
Mar 29, 2002 1:27 PM
Thanks Radical Ron! NMRadicalRonPruitt
Mar 29, 2002 1:44 PM
Did they hook you up?
You Are Getting Ripped Off By SpokesRollinFast
Mar 29, 2002 1:31 PM
You are being charged way too much for your Dream. You can pick up a Dream on the internet from places like for under $1300. I don't know about you, but I would like to save over $500 and get the same frame. $500 would be a great downpayment on the components or wheels.
Something I just tried and it appears that it will workLone Gunman
Mar 29, 2002 1:34 PM
I use both a blackburn airstik and co2s. My blackburn is attached in the rear triangle, I do not like the stress that the water pump attachment gizmo puts on the WB boss. I just tried to attach a co2 cartridge in the rear triangle pump holder attachment that has 2 plastic ring type pump holders along with a velcro strap. That strap and the plastic holders will steady the cartridge and hold it firmly in place. If you were to use the bottle gizmo, and the rear triangle gizmo and put one cartridge in the co2 dispenser, well how many do you want to carry? The gizmos I have were bought at the LBS.
Why not put a cartridge in each end of your handlebar? nmsearcher
Mar 29, 2002 1:44 PM
Why, that's where I keep my hash pipe...Snirp
Mar 29, 2002 2:57 PM
Hmmm, maybe I should pull the bike apart and jam every tube with co2 cartridges? I'll be a neutral service vehicle for all the guys I ride with. I could steal an "Air - 25 cents" sign from the gas station.

Besides, Grzy said it's a dumb idea and he has never steered me wrong in the past. If however he's currently at the patent office, I shall be quite put out.

Radical, I have not called yet. I'm at work currently, and it's more low key to type than speak.

Anyone, could I save $500 by buying the co2 holder someplace else?

Have a good weekend, I'm outta here.
Put 'em in your bum.grzy
Mar 29, 2002 5:27 PM
Oh wait, I have a patent on that...
Well, they'd make a really big suppository...Gregory Taylor
Mar 29, 2002 5:35 PM
I used to just tape a couple CO2 cartridges together (hated the rattling sound as they jangled around) and jam them in a jersey pocket.

That is, until the damn thing exploded after I handed it over to a friend to use. Scared us sh*tless. Long story.

I now use a Backburn Airstik, and am completely happy.