And remember that modern tyres need to be inflated harder than period tyres
Put 24 PSI in a modern tyre and you are just begging for the tyr to walk around the rim & rip the valve out of the tube .
Not sure I can agree there - assuming one is using a similar type of tyre to that originally fitted.
My Honda runs 46psi in the rear (tubeless) but I presume we're talking classics here so, if by 'modern' we're talking a different
design of tyre, maybe - but, like using modern oils in our engines, I don't advise using something potentially incompatible with a classic. Especially tyres - could that, for example, invalidate insurance?
I like Avon Speedmaster and Dunlop K70. The ones I buy nowadays are softer than those I take off, but that's because they're 20+ years younger, not because of different construction.
I run 20psi in all my road-going classics (18psi in the rear of my rigid) and never had a tyre slip despite the rigid pushing out around 50 / 55 bhp and one of my GF's nearer 70. No tyre clamps either. When pressures were being discussed a while back, I tried high 20's in one of my GF's - couldn't wait to get back and lower the pressures. Handling and ride quality was unacceptable.