How much air should i put in my 1979 chevy k5 blazer 39.5 tires?

[live life to the fullest]

i just bought a 1979 chevy k5 blazer lifted with huge tires 39.5 and im wondering how much air should be in them?

 

[Alex]

Just the right amount.

 

[Frankie]

What does the tire say on it? 80psi?

You probably want to start with maybe 45psi and see how it handles, how the tread looks on the ground (even across) and how it wears.

My tires aren't quite that big, but they call for 80psi on the sidewall and I keep around 43psi in them. That's where I found the best handling and most even wear is.

 

[Mike G]

25 front -- 20 rear