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BARRONVC's Photo BARRONVC Posts: 1,856
9/5/12 12:21 P

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Don, nothing like a good frame pump. Today they don't allow for that in designs today.

Practice with that unit. I like simple. Just a simple valve with very fine threads and a small needle to meter the CO2.

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KJEANNE's Photo KJEANNE SparkPoints: (39,464)
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9/5/12 12:15 P

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Since I ride in small groups or by myself, I'm never in a rush to change my tire. I haven't had much luck with the C02 stuff.

I like the Topeak Road Morph G Bike Pump with Gauge. I want to change the inner tube, pump it up and not have to deal with the thing again. The air pressure gauge is a nice addition. There's also a small flip down foot stand that stabilized the pump so I can get all the pressure I need.
www.amazon.com/Topeak-Road-Morph-Bik
e-
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r=
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DDOORN's Photo DDOORN Posts: 23,573
9/5/12 11:58 A

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Ah okay, thx for setting me straight on that. The talk among those posting at Amazon can definitely confuse one and lead a person to believe that these are different models.

Don

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9/5/12 11:55 A

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Huh? I have a 20+ year old one and one a few years old and the only difference is my old one came with a bag of parts to convert from presta to schrader while the new one only required a part in the head to be flipped.

The #1-#4 are sizes. Years ago most cyclists carried one water bottle and put their pump on the seat tube. You would order the number of pump based on the inside measurement of your seat tube and it would fit without clips.

DDOORN's Photo DDOORN Posts: 23,573
8/30/12 11:31 A

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I see there are at least 4 incarnations of the HPX and one fellow strongly encourages the earlier models:

www.amazon.com/Zefal-Classic-Frame-B
ic
ycle-Silver/dp/B0013IU2YW/


Don

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Don't die with your music still in you. -- Dr. Wayne Dyer

"We either make ourselves miserable or we make ourselves strong. The amount of work is the same." --- Carlos Castaneda

"You yourself, as much as anybody in the entire universe, deserve your love and affection." --- Buddha

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DDOORN's Photo DDOORN Posts: 23,573
8/30/12 11:24 A

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Gotcha, thx again!

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Don't die with your music still in you. -- Dr. Wayne Dyer

"We either make ourselves miserable or we make ourselves strong. The amount of work is the same." --- Carlos Castaneda

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8/30/12 11:22 A

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When you get your Zefal pump look for the HPX. Zefal makes other models including plastic and mini pumps. There may be other models that are good but I can only vouch for the HPX.

DDOORN's Photo DDOORN Posts: 23,573
8/30/12 8:54 A

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Thx for the tip on the Zefal frame pump. I've been a bit nervous about going longer distances, touring, etc., far from bike shops, etc. with a frame pump that just doesn't cut it when it comes to the higher pressures my tires need.

Don

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Don't die with your music still in you. -- Dr. Wayne Dyer

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8/29/12 11:16 A

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According to the chart that came with one of my inflators a 12gm cartridge inflates a road tire to 90 PSI and a 16gm cartridge inflates it to 130. It only listed one pressure for all road tires which is suspect because a 27x1-1/4 tire has a lot more volume than a 18mm 700c tire. These might be a little optimistic because I remember some cyclists using 2 12gm cartridges to air up their road tire. In any case a CO2 cartridge of either size should get you home with care.
I carry a Zefal HPX which is probably the best frame pump ever made and it has never let me down. It is one of the few pumps that can inflate a tire to 120 PSI without requiring the strength of a gymnast and being mostly aluminum will hold up for a long time. If function is more important to you than style than buy an HPX and be done with it. There have been many times I've stopped to help cyclists who couldn't get enough air in their tires with their mini pump or it broke it trying.
I often carry a CO2 inflator as well to use if I'm in a hurry to get back on the road.
CO2 is used for portable inflators because it goes through a phase change to liquid at reasonable pressures so CO2 cylinders can be compact. The CO2 in your inflator is liquid and expands a great deal just as water expands a great deal when it phase changes to steam. Nitrogen doesn't go through a similar phase change. A nitrogen cylinder would have to be larger and under higher pressure to hold enough gas to inflate a tire. Theoretically you could carry a cylinder of liquid nitrogen but nitrogen doesn't phase change to liquid at room temperature until about 11,000 PSI which is even higher than my Zefal HPX can manage. The cylinder would also reach cryogenic temperatures when used.

BARRONVC's Photo BARRONVC Posts: 1,856
8/28/12 3:19 P

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O2 is more compressible that CO2.

That is why I put in about 30 to 40 lbs of air in there before using the CO2. I made some adapters that have a finer thread and needle value. If I get time to make a run of these I'll put them up for sale and let you know. They are easy to control but still get really cold.

Like the man said you have to practice. I ride marshal a lot of rides, Du's, and Tri's so I change 100's a year.

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BLUE3505's Photo BLUE3505 SparkPoints: (2,580)
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8/28/12 3:02 P

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Like Barron said, it's usually a temporary emergency fix. When you've got a flat on the roadside, all you're trying to do is get enough CO2 in the tire to get you home. You don't worry much about the proper pressure. You're just thankful to have any pressure at all!

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2WHEELER's Photo 2WHEELER SparkPoints: (48,398)
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8/28/12 2:33 P

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Check with your LBS for the best advice. I just went on a "flat tire ride," where we rode for awhile, let the air out of our tires and practiced fixing a faux flat. We used the CO2 cartridges for the first time. (They are very easy to discharge before you are ready, so be sure to have extras on hand or, better yet, take your hand pump as a backup.) Any how, if I recall correctly, it took one 16 gr cartridge to fill the road tire, but it did not get it up to 100 psi, but it is firm enough to ride without any problems--I'm guessing, by the feel of the tire, that it's around 80 psi. The most surprising thing I learned is that a tire filled with CO2 will be flat the next morning and must be inflated with air, not CO2. I don't know why it goes flat overnight, but it will. Hope this was of some help.

Edited by: 2WHEELER at: 8/28/2012 (14:34)
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BARRONVC's Photo BARRONVC Posts: 1,856
8/28/12 2:30 P

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I use it for emergencies. I still take a pump and get the tire seated. Then I let the CO2 rip. The seal is not always great so you get what you get. Most of the time it will get you home, to a pump, or your car.

I use the larger sizes. You can experiment, check the pressure.

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LIV2RIDE's Photo LIV2RIDE Posts: 6,208
8/28/12 1:56 P

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This is an awesome question seeing as how I just got my road back all together including the CO2 cartridges. Looking forward to all of the wisdom from this team.

Kelly

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DDOORN's Photo DDOORN Posts: 23,573
8/28/12 1:05 P

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Haven't tinkered with CO2 myself, but in talking with other road cyclists I've heard that it can be pretty tough with CO2 to reach that 100 psi range that most of us have on our tires. For that matter, the same can be said for a lot of frame pumps.

Don

Edited by: DDOORN at: 8/28/2012 (14:00)
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ON2VICTORY's Photo ON2VICTORY SparkPoints: (47,432)
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8/28/12 12:58 P

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how do you attain the correct air pressure when using a basic CO2 kit on a high pressure tire? i know it is a pretty basic question but i have not done a change yet with my kit. how do you avoid over / under inflating a HP tire set up when pressure is so critical.

pressure range on my tire/ tube set up is 95-125 psi

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