Nitrogen experiment

Is water / water vapor somehow eliminated as a variable in this experiment?

Did you run each test, say 5 times, then throw away the largest and smallest result? :) Sounds like you didn't account for variations in moisture across the tests.

If you're really interested in "testing" the affect of moisture on pressure change. Start with a control of a dried tire and rim. Repeat with a dry tire and rim adding known increments of water for each test. As long as you get a baseline, it shouldn't matter whether you use compressed air from the same compressor or nitrogen. Is the shop climate controlled? :)

I was really hoping to read about something exploding..

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Originally Posted by Alan Etheredge

Is water / water vapor somehow eliminated as a variable in this experiment?

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Nope, I'm fairly sure that's what's effecting the changes, and since I want as stable a setup as possible, ill be playing around like Sean suggests with the variables.


And Jeremy, from this day forth you shall be known as "mr. Wizard"!!!

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Originally Posted by Kasey Lewis

And Jeremy, from this day forth you shall be known as "mr. Wizard"!!!

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Wait, I thought Jeremy was short for Gandalf.

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Originally Posted by Sean Gurevich

Wait, I thought Jeremy was short for Gandalf.

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Could be, this is all a see when I'm on the same track with him.....

http://i1098.photobucket.com/albums/...psf1ccfdd2.png

Mr Wizard saved Tutor Turtle from lots of bad situations. It's a compliment........in some cultures.

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Originally Posted by Kasey Lewis

I'm retarded? I don't know really. It's not a lab setting, but I kept things similar. Different tire On a different rim, but I can't explain one vs the other. If anything I would have expected less growth on a smaller tire/rim. It's interesting, and ill play with it some more to see if i can find out.

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do you mean as in front/tire tire, or just different brands ?

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Originally Posted by Mitch Williams

Mr Wizard saved Tutor Turtle from lots of bad situations. It's a compliment........in some cultures.

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Here Mitch hold my tin hat for a second...I'm really avoiding this because I'm sure there are GP teams intensely awaiting a discovery but...

"air" = ~78% nitrogen
volume inside the bead sealed tire doesn't change (negligibly) and the gas volume required to raise the pressure from standard to operating doesn't quite double so unless you have a vacuum in the sealed tire before filling with gas you're never more than ~90% nitrogen. Which is probably a good starting point for negotiations at the tire shop when they offer it for an extra charge. If any of this is wrong I don't want to know it because it plays no bearing on selling smoothies.

In summary, put an appropriate amount of air in your tires and go ride.

Now give my hat back Mitch.

His cat's breath smells like banana strawberry cat food.

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Originally Posted by Joe Rodriguez

do you mean as in front/tire tire, or just different brands ?

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Both, different tires on different rims.