co2 inflator for Fatbike

fatboyonabike · Jan 24, 2015

Folks...has anyone had any issues using the standard 16g co2 canisters on fatbike tyres trailside?..were talking 4 inches plus here... my fatboy has 4.6 inch wide tyres, so lots of volume needed.
am setting up a trail kit for the new fatty, and wasn't sure if a 16g will cut it..will I need to take 2 per tyre.
I have a Genuine Innovations co2 kit for my trailbike, it uses a 45g co2 canister and a small valve head that screws on - but at $30+ per canister, that aint gonna happen.
any info would be great.

Dales Cannon · Jan 24, 2015

I gave this some thought but couldn't get a definitive answer. As I will have one of the 4wds when I take the Muru somewhere I will have a compressor available. Be interested to know though. You can do the experimental research and publish the paper! I don't have a CO2 pump to try.

hathill · Jan 24, 2015

You'll need one of these.

16 grams CO2 ain't gonna cut it...:dance:

fatboyonabike said:
Folks...has anyone had any issues using the standard 16g co2 canisters on fatbike tyres trailside?..were talking 4 inches plus here... my fatboy has 4.6 inch wide tyres, so lots of volume needed.
am setting up a trail kit for the new fatty, and wasn't sure if a 16g will cut it..will I need to take 2 per tyre.
I have a Genuine Innovations co2 kit for my trailbike, it uses a 45g co2 canister and a small valve head that screws on - but at $30+ per canister, that aint gonna happen.
any info would be great.

tasty.dirt74 · Jan 24, 2015

fatboyonabike said:
Folks...has anyone had any issues using the standard 16g co2 canisters on fatbike tyres trailside?..were talking 4 inches plus here... my fatboy has 4.6 inch wide tyres, so lots of volume needed.
am setting up a trail kit for the new fatty, and wasn't sure if a 16g will cut it..will I need to take 2 per tyre.
I have a Genuine Innovations co2 kit for my trailbike, it uses a 45g co2 canister and a small valve head that screws on - but at $30+ per canister, that aint gonna happen.
any info would be great.

What air pressure would one get you to? Fat tyres run at 6-8psi.. Maybe sacrifice one to find out?

MARKL · Jan 24, 2015

I cant see the 16g ones cutting it. When I take my Sasquatch out I just take a mini floor pump and

ray:I wont ever have to use it.

bell.cameron · Jan 24, 2015

The maths says that a standard 16g CO2 canister should do about 8L of CO2 at 20 degrees and 15 PSI. If youre running lower pressures i think this might actually cut it without trying to work out the capacity of your tyre...

bell.cameron · Jan 24, 2015

Correction I fucked that up, that would be 8L at atmospheric. Without doing the proper calc, half that. So you might be pushing it a little...

T-Rex · Jan 24, 2015

If one isn't enough, use two. if you are riding a fat bike you clearly are not a weight weenie.

fatboyonabike · Jan 24, 2015

don't think 2 would cut it either!..
I never really understood the whole weight weiner thing, total waste of time if you ask me..
found some 40g cartridges, but run propane instead of co2-but uses standard co2 pump fitting, and the canister doesn't have to be made of thick steel either, as propane can be contained at a much lower pressure than co2.
and if i get a flat, I have the choice of having a BBQ or re-inflating my tyre.

camoshop · Jan 24, 2015

Have you tried one 25g one it's more than enough for a 29er tyre.

3 for 10$

T-Rex · Jan 24, 2015

fatboyonabike said:
don't think 2 would cut it either!..

Test it and let us know, they are only about $1 each.

rone · Jan 24, 2015

camoshop said:
Have you tried one 25g one it's more than enough for a 29er tyre.

3 for 10$

This^ *10 char*

The Duckmeister · Jan 24, 2015

I reckon you need four....

I'm a pretty shit maffematician, but this is basic enough to be within the bounds of my capabilities.....

One 16g cartridge is good to get a 26x2" tyre up to the right firmness (I'll use the term "firmness" rather than "pressure", due to the fact different volumes end up at different pressures to achieve the same feel".

A 4' wide fattie is not only double the width, it is also damn near double the height, so you end up with four times the cross-sectional area, and when formed into a tubular structure, four times the volume. That's working in squares, but tyres ain't square, nor are they straight.... Knock the corners off the square section & you'd be back to maybe 3x your starting reference, but when you go & wrap it around a rim, you're left a bit short at the outer extremity. So you fill the gap & there you have close enough to four times the volume of a 2" wide tyre

So you need four canisters.

rone · Jan 24, 2015

The Duckmeister said:
So you need four canisters.

If you needed to inflate it to the same pressure as a 26x2 tyre. Which you don't. 8-10 psi is ample.

fatboyonabike · Jan 25, 2015

rone said:
If you needed to inflate it to the same pressure as a 26x2 tyre. Which you don't. 8-10 psi is ample.

thanks rone,i take it you have been down this road before with a bike very similar, if not exactly the same! has that big green bike with the skinny tyres turned up yet?

mitchy_ · Jan 25, 2015

i'm not fluent in fat bike tyre names and their corresponding sizes, but this thread makes mention to a few models and how they worked.

http://forums.mtbr.com/fat-bikes/co2-fat-tires-746862.html

general consensus says a single 16g should be enough to get you rolling. a pair of 16's would get you around 6-8psi.

reign_rider · Jan 25, 2015

http://www.ballards.cc/tyre-repair-kit/

Motorcross bikes are using 16g canisters in their repair kits. Not sure if one for one inflate though

camoshop · Jan 25, 2015

25g as said above will be enough, or take a mini pump and attach to your frame, they usually come with a mount that goes under the bottle cage

Dales Cannon · Jan 25, 2015

Propane? When I was building up the bike I used a small hand pump to put some shape in the tube before fitting the tyres, well I started to. Fired up the compressor. Many many pumps just to get basic shape.

Still cannot get my head around putting propane in tyres. A guy here who fatbike at Moreton told me that it would take at least two cartridges but again depends what pressure you want. When we camping before Christmas I put a palm frond through the rear on the beach. Luckily only a couple of km from camp. Just fitted a new tube using the compressor in the 4wd. I was only running 9psi at the time. Might have to get a CO2 inflator and give it a try. But not propane!

fatboyonabike · Jan 25, 2015

Dales Cannon said:
Propane? When I was building up the bike I used a small hand pump to put some shape in the tube before fitting the tyres, well I started to. Fired up the compressor. Many many pumps just to get basic shape.

Still cannot get my head around putting propane in tyres. A guy here who fatbike at Moreton told me that it would take at least two cartridges but again depends what pressure you want. When we camping before Christmas I put a palm frond through the rear on the beach. Luckily only a couple of km from camp. Just fitted a new tube using the compressor in the 4wd. I was only running 9psi at the time. Might have to get a CO2 inflator and give it a try. But not propane!

why not propane?..its all about upper and lower explosive limits, if that is what you are concerned about?
if you buy a new fridge, or even any new aircon equipment now and into the future, it will contain some sort of flammable refrigerant..be it iso-butane(lighter fuel) or purified propane.
all the refrigeration equipment in ALDI stores has been using R600a and R290 for a while now!

co2 inflator for Fatbike

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