i'm thinking it's something like this...

if the OEM specs is

32 PSI @ 90 load index and max tire pressure of 50 PSI

and let's say I switch to a 90 load index and max pressure of 45 PSI then I should lower my pressure to maybe 30 PSI

this is correct?

what happens if the load indexes are different, so let's say my next load index is 92 and max 45 PSI.

i'm trying to see if there's some formula for translating the OEM specs to a new set of tires with different load index, max pressure.


thanks

 

If the tires are going onto the same car the air pressure would be the same. It is not air volume it is air pressure you are measuring. The car stays the same and so would the air pressure.