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A bicycle inner tube made of a butane reistant grade of neoprene
This has two notable benefits:
1. The tyre can be inflated from a can of regular butane gas. No need
for an air pump. Quick, cheap, effortless.
2. In the event of a puncture, simply re-inflate the tube with butane.
Any leaks not immediately obvious can be quickly located with the aid
of a naked flame.
Was expecting something like this...
[2 fries shy of a happy meal, Mar 14 2013]
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||3. When the leak has been located, wait just long enough for the rubber around the leak to be softened in the heat, then pinch the leak shut. The fire goes out and the melted rubber seals the hole.
||[Lurch] Both tire and tube are vulcanized, which
means not so much on the melting.
||[8th] Where are you that you have more ready
access to butane than air or CO2?
||There's also the fact that butane will be liquid
under most riding conditions (tire pressure and
temperature), which will tend to
increase your rolling weight and decrease the
cushioning effect of pneumatic tires. Not generally
considered a good thing.
||Is butane a liquid at normal bike tire pressures ?
||No, that's around 500psi from memory. Bike tires
rarely go over 100.
||Butane is a liquid at 32 F (0 C) and 14.9 PSIa. It
remains a liquid at anything above above
60 PSIa all the way up to 120F (49 C). Riding a
bike or fat bike (low tire pressure) in very warm
weather, it might
remain a gas, but only then.
||The 500 PSI is the critical point, at which gas and
liquid are indistinguishable, but it isn't relevant to
||Source: NIST Chemisty webbook.
||if propane's got the same problem, I suggest
methane, after that I'm out of ideas, I'm at the end
of my chain.....
||Propane would work for mountain bikes except in
extreme cold riding conditions, but would be a
problem for road bikes.
||Methane would work fine, but I'll stand by my
objection re: compressed purified methane vs
compressed air or
||natural gas, every science lab and most kitchens...
pressurized, which means a pump would be required,
and up to 20% longer hydrocarbons that will end up
liquid inside the tire.