I just had installed 4 new Pinnacle MT Grizzly Grip tires. 265/70/17. Great tires even though they are made in China. (I found this out after the fact.) I try to buy American as much as possible. For the tread they are relatively (sp) quiet. I do have a question. I checked the air pressure and they have 48 lbs. in each tire. Mind that they are 10 ply also. All it says is 80 psi max. Any idea on the proper inflation for regular road driving?

 

I'd say you're good with 48, I wouldn't go less than 45, and you could run them up to 60 for normal use. Experiment and see what feels best and monitor wear. Wearing in the middle is over inflation, wearing outside edges is under inflation.

 

Thanks for the input. I will give it a try.