I've recently swapped from 165 80 R15 tyres to a new set of 195 65 R15 on my 1966 P1800S.
Smooth ride, no fouling in the wells etc. Steering slightly heavier at 30psi so I took up the pressures to 32, any higher and the steering feels too light.
I changed when I discovered that my old tyres were 20 years old so I've basically transitioned from rock to rubber !
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