Paul...
That's an incomplete answer.
For example, Helium's thermal conductivity MAY be higher than other gases..... but gases are notoriously AWFUL at conduction, whereas, they allow radiation and convection to occur easily.
The transfer of heat between the walls of the tyre and the rim would seem to be the more effective transfer 'path' of heat. In the same vein, doesn't 'convection' describe the action of heat transference in a rapidly moving gas in a tyre?
Compressability looks 'odd' in this, too. As far as I remember: the equations for the relationship temp, volume and pressure of gasses does NOT include 'type' of gas involved. Are you claiming that some gases are more 'compressible' than others at the same temp/pressure? Assuming that 'compressibilty' is a function of the mass of the 'molecules' of the gas, wouldn't that imply that HEAVIER gasses would be less compressible?
Expand on your answer so that we can understand what you are saying.
Ian
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