Adjusting tyre pressure with CO2 cylinders?

[Kritou]

I carry a 12v compressor for puncture repairs but I'm looking for a "tool" for quickly adding a couple of psi to a tyre without having to use a manual pump or waiting for a forecourt airpump

Do any of the CO2 cylinder attachments, perhaps one of these, allow you to do this without depleting the whole cylinder?

 

[Kit monster]

Several years ago I used CO2 bulbs for puncture repairs. At the time I had an FJR1300 and got a complete flat in the rear tyre. The 'Stop n Go' kit I used had a very basic filling valve which I quickly realised only allowed a whole cylinder to be discharged before you could change it for another.

I then bought what looks similar to the gizmo - 2nd from the left in your photo, which I purchased from a cycle shop. The red knob is basically a tap. You close it off, screw the brass knurled piece onto your tyre valve then attach the CO2 bulb, then simply open the red tap to transfer the gas (as much as you want or need to). To fit another bulb simply close the tap, unscrew and re-fit a new bulb, then re-open the tap to continue filling the tyre.

This is a quick and convenient way to get enough pressure into a completely flat tyre. I found out during one such roadside puncture that a completely flat 180 rear tyre needed about 6 bulbs to get it back up to a reasonable pressure. I then converted over to a 12v mini compressor so I wouldn't have to faff about carrying loads of CO2 bulbs.

I'm now about to buy my first BMW (GSA) and will be going back to CO2, due to the lack of space available for bulky compressors. I'm an engineer by trade and I've made a nifty box to bolt up under the crash bars between the fog lights. This will hold my puncture kit and up to 10 bulbs. So hopefully this will be enough for one or two punctures if I'm unlucky enough to get two on one trip.

I hope this helps and is the answer you were looking for.

 

[Kritou]

N

....... I hope this helps and is the answer you were looking for.

Partly .......

I'm interested to know if these valves can be used to add pressure to a tyre, turned off and at a later date be used to add more gas from the same cylinder - or are they one shot only?

 

[nick.ct]

They can be turned off and used at a later date....................... but, not much later. The cylinders use very high pressures to store a useful amount of gas (8MPA typical filling pressure is over 1100PSI) so keeping this contained for any length of time once the seal of the cartridge is broken is difficult.

Large cartridges with threads will probably be your best bet

 

[Beemerman59]

Wouldn't ten cylinders take up the same amount of room as a small compressor such as a Slime pump? I have a tool box which lives behind the pannier frame and this carries all the tools, puncture repair kit ans Slime pump that I need.

 

[Kit monster]

Wouldn't ten cylinders take up the same amount of room as a small compressor such as a Slime pump? I have a tool box which lives behind the pannier frame and this carries all the tools, puncture repair kit ans Slime pump that I need.

I've got an Airman compressor and that fits in the box I've made too, so yes I still have either option.

 

[Fanum]

I carry a 12v compressor for puncture repairs but I'm looking for a "tool" for quickly adding a couple of psi to a tyre without having to use a manual pump or waiting for a forecourt airpump

Do any of the CO2 cylinder attachments, perhaps one of these, allow you to do this without depleting the whole cylinder?

Yes, but don't bother*

You'd have to carry more CO2 cylinders than the space a decent 12v pump will occupy to inflate a tyre, and if it only needs a few PSI, what's the point in carrying a pump AND some CO2 cylinders?

You're looking to over complicate things IMO.


* Although in theory you can partially use a cylinder with some systems, I guarantee that six months later when you might need it again, that cylinder will be empty.
Do you want to rely on that?

 

[ButtonMoon]

Yes, but don't bother*

You'd have to carry more CO2 cylinders than the space a decent 12v pump will occupy to inflate a tyre, and if it only needs a few PSI, what's the point in carrying a pump AND some CO2 cylinders?

You're looking to over complicate things IMO.


* Although in theory you can partially use a cylinder with some systems, I guarantee that six months later when you might need it again, that cylinder will be empty.
Do you want to rely on that?

He's right you know.

Last year I had C02 from an old bike & a pump, got a flat, repaired it and used three canisters and it still wasn't anywhere near right pressure.
Slime pump is the bollocks ! Gets a GS rear tyre on the bead no worries!! Silly name for a pump! Should be called "The little compact fits anywhere MOFO super pump"


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