Thanks Capri. I never worked on the rubber end of car design, just the performance & emissions end
So, I can't just say that my car has a corner weight of 228kg and the tyre's max loading is 387kg..... so the sidewall maximum of 51psi can't be scaled up to 72psi due to the loading being only 60%???
Shame its not that easy!
Plugging 36psi into the equation instead of 51 gives a maximum of ......... 51psi based on scaled pressure due to less than maximum loading!! Wierd!!
Edit - Have I got this back to front?? The tyre's maximum loading increases with increasing pressure.... but does its maximum pressure decrease with decreasing load???