I had the three main gas laws—Boyle's, Charles' and Henry's—drilled into me from my days in BSAC (scuba).
Gases heat up as they are being compressed, one of the two reasons for immersing scuba tanks in water whilst being filled (the other being to mitigate the effect should a bottle fail). Gases rapidly cool when being deflated which is why those tiny CO2 canisters used to inflate a tyre have a mesh cover—the canister drops to subzero temperature.
Charles' law states the pressure varies directly in proportion to the temperature (°K) which is why you are told to measure tyre pressures when the tyre is cold, but many people don't realise this. When the hot tyre cools the pressure drops and the tyre is under inflated.
On another thread here or maybe another forum, someone was asking me how I was getting on with mousses in my KTM 690R (supposedly the equivalent of 0.9 bar or 13 psi). I had to say that I couldn't actually notice any difference between my 690 in Spain with mousses and my 690 in the UK with standard inner tubes which are probably at 2 bar.
So as Ted says, just keep riding.
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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)
Last edited by Tim Cullis; 6 Jan 2016 at 11:52.
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