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TI_roadracer said:
Why don't people fill their tyres with helium instead of normal air, woulnd't this make them much lighter and allow the bike to "fly" (excuse the pun)
Expense. Helium is the most difficult gas to contain. The weight difference is insignificant, even to weight weenies.
 

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TI_roadracer said:
Why don't people fill their tyres with helium instead of normal air, woulnd't this make them much lighter and allow the bike to "fly" (excuse the pun)
What's the difference? You either have 120 lbs of air in your tires or you have 120 lbs of Helium-either way they weigh the same.:idea:

HTH!!!!
 

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Kerry Irons said:
Actually, hydrogen is much more difficult to contain than helium. Flammable too! :)
It's more difficult when it oxidizes rapidly, but otherwise naturally occuring hydgrogen is diatomic and is larger than garden variety monatomic Helium. Jeez. Engineers.:rolleyes: :)
 

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alienator said:
It's more difficult when it oxidizes rapidly, but otherwise naturally occuring hydgrogen is diatomic and is larger than garden variety monatomic Helium. Jeez. Engineers.:rolleyes: :)
Engineers have to deal with the actual experience in the field, and for sure, it is MUCH harder to contain hydrogen than helium. With helium, you can easily keep it "in the pipes" with normal fittings and such, but hydrogen is much more difficult. Full stop. I don't have specific permeability data relative to tires/rubber, but I expect that H2 would go through rubber much faster than He because it would be much more soluble in the rubber itself. There's a lot more to gas permeability than just molecular diameter.
 
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