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Personally, I have recently started taking 3 readings:

1) Cold (ambient temp)
2) While on warmers (fully heated at mid-temp setting)
3) Immediately after a session

I don't have enough info at this time to make any quasi/pseudo intelligent observation but there really is a difference between number's 2 & 3 above.
Clearly #2 is easier to measure in terms of consistency.

I find that the front increases about 10% and the rear increases about 12.5% from cold to hot... makes sense since the rear tire volume is greater but then again.... I'm shooting in the dark about this stuff!
 

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xseal said:
Pirelli recommends warming their slicks to 135. Different manufacturers recommend different "starting" warm pressures, Dunlop is around 195.

I didn't measure when we got off, interesting question will check the next time. My hunch is it varies a bit based on grip of track, ambient temp, whether the sun is out, etc. That's why Pirelli recently started recommending setting pressures at warmed temp, rather than cold. There is a 3 lb different in their warm and cold recommendations, though.
Do you have a link to the Pirelli site that mentions recommended air pressures?
 
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