about 105-110 if they are ~23mm wide tires

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter

How should pressure be changed as width and diameter change? Say, on a 650?

They are 23mm.

Thanks :)

Other than to use what you have trained with for the usual good reasons, it is common to lower pressure for wet conditions..

I am same mass and same bike as you, but with likely different weight balance front to rear, but in general, dry is 100FR, 110RR for 23mm GP4000s on 700C on an Aeolus wheelset (wider)
I dropped 5 psi front and rear for wet IM, noting that with latex inner tubes I would loose a few more PSI on course as well.. this is for typical road surface, NOT chip seal, and not heaven sent hotmix....

What is the weight of the rider and which 650 tire are they using?

jaretj