PSI for A/T tires?

The sidewall says I can run up to 80 PSI and they were installed with 75 PSI. I’ve read multiple people saying ideal range is 30-35. Can anyone attest to this?

 

i run 35 psi in my falken wildpeak at3, never had a problem.

 

I'd be horrified if someone put 75psi in my tires, it doesn't matter what the sidewall says. I run 35, try the chalk test to figure out your best pressure.

 

the actual answer is revealed through a chalk test. otherwise it's rough guesswork.

i have E tires, 265/65-17 (ST Maxx).
F: 28 psi cold
R: 25 cold

comes up to 31/29 when fully warmed. drives and wears perfect in all conditions. all revealed through the chalk test.

 

32-35 Psi - Cooper Discoverer at3

 

Thanks guys! Can’t believe the auto shop installed them to that high of PSI!