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Old 2019-05-25, 05:28 PM   #16
lowerstackmac
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I think the helium would not take long to escape past a schrader valve, requiring a top up fairly often.
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Old 2019-05-25, 05:46 PM   #17
Vogelfrei80
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I was wondering just because I own a heavy hunirex, it has a 26" 3.8" road tire in a tubeless setup. I could easily access a helium can, I think I can also spend 20€ for a tube to insert in an already partially sealed tire. So my dumb question...

I will achieve a better result if I get slim, if I train more or if I spend 300€ for a carbon rim... but tomorrow I could spend 20€ in 5 minutes... not the same as getting slim, train for 10+ years or spend 300€...
But if it is a nonsense I will be glad to save 20€ too!
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Old 2019-05-25, 05:50 PM   #18
Vogelfrei80
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Wink

Thank you for your help. If I'll ever stumble upon a new tire ready to be helium filled at the same price of a normal tire I will have my test and let you know. Right now I won't use any leaking helium valve
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Old 2019-05-26, 10:41 PM   #19
leo
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this (kind of broken) video shows a TdF mechanic from Belgium using nitrogen + H₂O + most ("oil") filter - to purify the nitrogen.
You can see the pistol and filters after 1:42 or so.
It is meant to keep the temperature of (glued) tubes low, during long breaking in long down-hills.
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Old 2019-05-27, 03:56 AM   #20
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While I know the idea is very impractical, at least with the current equipment available, I still like the thinking of ways to improve on things a little bit, here and there.
A lot of those ideas might be crazy, but the occasional one can be groundbreaking.
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Old 2019-05-27, 07:25 AM   #21
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Quote:
Originally Posted by Vogelfrei80 View Post
I was just wondering about the rotational weight saving for a light road 3.8 fat tire with a fat foss tube.
I was also curious about how much the gas in the tire would lag behind the rest of the wheel on acceleration/deceleration. It was interesting to read that someone calculates it would not be very much.
Quote:
Originally Posted by OneTrackMind View Post
Should it be outlawed? Are people already doing it?
On the first question, being a member of the IUF Rulebook Committee for Track and Road racing, I would say no. Knock yourselves out. Hydrogen, on the other hand, I would advise against.
Are people already doing it? Not that I know of, but this community likes to experiment, so somebody has probably played around with the idea.
Quote:
Originally Posted by OneTrackMind
BTW Planes have their tyres inflated with nitrogen but it isn't about the weight.
I would guess that on planes, it's about not igniting if there's a problem with brakes or landing gear, or otherwise being more resistant to heat in such situations.
Quote:
Originally Posted by mrfixit View Post
Isn't helium a smaller sized element that would leak out of anything much faster than air or nitrogen? Don't foss tubes already have a problem that air leaks out regularly, all the time??
My understanding of Foss tubes is that they are a little more leaky than regular Butyl. Some say a lot more leaky, but on my 36", and the two different tubes I've used, both only lost pressure slightly more than regular tubes. So I would expect them to lose helium a little faster.

A HuniRex is going to be on the heavy side no matter what you do. What about trying a lighter tire? Of course there's the concept of a lighter you, but I would respond to that with it not being the same thing at all. If I lose weight, great! If the unicycle loses weight, great! If we both lose weight, better! It is okay to be a "weight weenie". Some people really enjoy the search for lightness, and the cycling industry responds over time, by making quality components that are lighter. Let the weenies do the experimenting and figuring out what's too fragile to be worth the effort, and what seems to hold up to lots of riding.
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Last edited by johnfoss; 2019-05-27 at 07:28 AM.
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Old 2019-05-27, 11:08 AM   #22
Vogelfrei80
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Nitrile is used in Helium storage

If anyone is interested Nitrile is the rubber used (a specific variant) to prevent helium leakage. Maybe it could be used as a liquid sealant...
If anyone as spare money to use try buying some and paint with it the inner part of a tube. I won't go on
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Old 2019-05-27, 10:09 PM   #23
leo
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Quote:
Originally Posted by lowerstackmac View Post
I think the helium would not take long to escape past a schrader valve, requiring a top up fairly often.
Easy to solve with valvecaps that closes-off the valve even more.
As a matter of fact; my unicycle has nitrogine valve-caps.

Quote:
Originally Posted by johnfoss View Post
My understanding of Foss tubes is that they are a little more leaky than regular Butyl.
Absolutely.
Just like latex (Vittoria, Michelin, Vredestein).
I still wish for 20" latex innertubes.
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