I did experiment with this when racing, and with pressure set to 30psi before a race, it was up to 35 / 36 after, confirming the 'experts' advice.

If the tyre is already at running pressure at the start of a race, it gets up to 38 / 39, and gets very slidey.

For the road, I use 32 Rear 34 front as the tyres are not worked consistantly hard enough to maintain the heat and therefor pressure.
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