Suzuki A100 tyre pressure

Anyone know the correct inflation for the above tyres?

I have recently inhertied a 1973 model A100, but sadly no documents or
manuals to go off.
Want to get riding in the meantime till I can track down a good book
(suggestions anyone?) oe owners guide etc.

Ta,
Chris

 

26psi front, 28psi rear.

 

ISTR 24/28 but that was 36-1/2 years ago, with contemporary tyres
(and tubes!).

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A rule of thumb I've read, take it or leave it, is that the correct pressure
is
whatever pressure will cause a 10% rise from stone cold to operating
temperature (ie: after 15 minutes or more of riding) Too much pressure and
the PSI
rise will be under 10%, the tire isn't warming up enough. Too little
pressure
and the PSI rise will be above 10%, indicating the tire is flexing too much
and getting too hot.

Ted