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Moisture in tires


silverbird1100

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The moisture, so long as it remains a vapor, will have very little effect in terms of pressure change. It still has to obey the gas laws. If it condenses into a liquid its impact can be significant.

External tread temperature can be very different from internal temperatures. The former is influenced by fricition with the road and flexure of the tread rubber (hysterisis). The latter, more by carcass flex and changes in ambient temperature than anything else.

Friend of mine on another board has all sorts of neat engineering software available and did the calculations once in response to a similar question. You really have to get to saturation before the effect of internal moisture starts to add more than a tenth of a percent or so to the temperature induced pressure rise.

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