How many 16 gram CO2 cylinders for a 17" tire?

Re: How many 16 gram CO2 cylinders for a 17" tire?

On Wed, 19 Sep 2007 11:52:53 -0700, Rick Cortese wrote:

> Not in this particular case because the CO2 in the cylinder is probably
> liquid/gas. The 16 grams is the only thing you can count on for quantity.
> I should go to the handbook of chemistry and physics to make sure about my
> 180 PSI at ~20C but feeling a bit lazy.

Yeah, I know what you mean.

Did the link on the volume of the torus help? If you use that what I'd
do is calculate the volume for a torus that completely enclosed the outer
dimensions of the tire and wheel, which would be a bit too big. Then I'd
calculate the value of the largest torus that would fit inside the the
tire and wheel.

Then your true volume would have to be between the two values. I'd take
a simple average of the two volumes and that ought to be awfully close
to the true volume.

Another sneaky method would be to fill a tub with water and have an
overflow tray under it. Submerge the mounted tire in water and measure
how much water overflowed. Then do the same for just the wheel.

Then the gas volume would be = Volume Full Tire - Volume of the wheel

If you really want to be precise immerse just the tire alone and
subtract that volume from what you got above. If you are careful that
should be accurate within 1%-3%

That's a lot of work though.

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Re: How many 16 gram CO2 cylinders for a 17" tire?

M. MacDonald <mmacdonald@bc.cc.ca.us> wrote:

> Regarding those CO2 tire inflator kits, anyone know how many cylinders it
> takes to get a rear 180x70x17 tire back up to 40 psi?
>
> Dealer says a lot, maybe 7-8 cylinders.
>
> Anyone need to use one?
>
Not yet. I think BMW packs two or maybe three in their puncture kits
(I'd have to check), and so I'd assumer they know the reality, and pack
that many.


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Re: How many 16 gram CO2 cylinders for a 17" tire?

On Sep 17, 12:26 pm, "M. MacDonald" <mmacdon...@bc.cc.ca.us> wrote:
> Regarding those CO2 tire inflator kits, anyone know how many cylinders it
> takes to get a rear 180x70x17 tire back up to 40 psi?
>
> Dealer says a lot, maybe 7-8 cylinders.
>
> Anyone need to use one?

I don't think you need 7-8 cylinders, but a pump
would be less bulky if you did.

I normally use a $10 Walmart tire inflator with
the plastic housing and fan removed. At a rally
last weekend, I saw the same $10 Walmart pump
reworked a little more elegantly than I'd bothered
with selling for ~ $45.

Wire an ordinary lighter socket into the electrics
to provide an outlet to plug the pump into. Also
very useful for quickly inflating your air mattress
at night when you pitch camp.

Re: How many 16 gram CO2 cylinders for a 17" tire?

On Mon, 17 Sep 2007 23:59:35 -0700, Rob Kleinschmidt wrote:

>> Dealer says a lot, maybe 7-8 cylinders.

> I don't think you need 7-8 cylinders, but a pump would be less bulky if
> you did.

I use a regular Kmart bicycle pump for 110/90-18. Might take a bit of
time pumping one up that was completely flat but I can go from 30 to 40
PSI in about 3-4 minutes or about 8-10 pump strokes.

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