"the only reason they use CO2 in puncture refills is because air (oxygen) in high concentrations of flamable and would then be considered a dangerous good which would prove to be a nightmare for shipping."
"He is probably 2 x-pensive. Now, neon is lighter than argon and could also be used to light up the bike.
But the real goer must be hydrogen. Nothing is lighter, you can get it readily by electrolysing water and it can also be used to blow up the…"
"A close reading of that article suggests that filling with air will give you more N2 in the tires than in the atmosphere, due to selective permeation of the vulcanized rubber by O2. Thus, to get N2 in your tires, inflate with air and leave...
"CO2 leaks out even faster than air - good to get you home, but won't last overnight.
Nitrogen does leak out lots more slowly - it permeates at about 1/3 to 1/4 the speed of oxygen (Are Nitrogen Molecules Really Larger...). So maybe you could…"