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Ideal Gas equation: pV=nRT With +15oC and -20oC the pressure ratio between the two is: p1/p2 = (273+15)/(273-20). Or 13% higher pressure when put in the garage. However that is assuming you are pumping it to maximum pressure, that the tyre can no longer (or very slightly) expand, making V (volume) constant. That is the basics for your assumption. ...


The right answer to this (as with all tire pressure questions) is try it out as the sidewall ratings (and anyone else who gives you an answer with a number in it) is likely giving you nonsense. In fact, you should not be near the max sidewall rating in winter (or in summer) in most cases and thus this is not something you should be worrying about if your ...

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