Tried to search but didn't find clear answer. OEM tires are P265/70R17 and on driver's door sticker says that air pressure for such tires should 35 psi. Now, I bought winter tires Bridgestone Blizzak DM-V1 which are 265/70R17 i.e. not P(assenger), do I need to inflate these tires to 35 psi as well? Next year I'll change my "summer" tires to LT265/70R17 so 35 psi again? Sorry for such dummy question but I'd like to understand how it works

 

Read on the sides of the new tires and see what the PSI of air should be. Mine require 60 PSI max.

 

Is standard pressure also printed on sidewall? I mean, the most comfortable pressure

 

That 60 PSI max means that the maximum allowable pressure to put into the tire. It doesn't necessarily mean that you have to put in 60 PSI. 35-40 is usually the average pressure. Of course, the higher you go, the more you'll feel the road, and vice-versa.

 

the vehicle recamended tire presure is for the best ride the tires recamended tire pressure is for the longest life and best handling of the tire. So its ethier smoother ride or longer tire life id go with longer tire life.

 

II'm pretty sure my Coopers are 50psi max and I have them at 35psi. I run all my vehicles at that.
I don't believe I have ever put the max psi in any of my tires of all the vehicles I have ever owned or serviced. Max psi = rough ride and allows less sidewall flex. I did try 40psi in my Coopers and OMG could i feel the difference. Much stiffer, so i backed 5psi out.

For winter tires, you'll want to make sure the sidewalls aren't overbulged. That will make the tire sit up on the snow more. I would think 35psi is plenty to prevent that.


Remember the fill pressure is rated when the tire is cold, not after you have driven on it for 20minutes as that increases the pressure.

 

it should be the same pressure as on the door if its the same size tire and load rating.

and if the load rating and/or the tire size change then you are supposed to go with about 75 - 80 % inflation of the max pressure on the sidewall

 

Interesting.
OEM tires have load index 113 and max 44 psi, recommended 35 psi i.e. 80%
Winter tires have load index 115 and max 44 psi so I assume it also should be 35 psi.
Looks like this formula works. Thx.

 

BTW, how towing affects tire pressure? I mean should I go closer to the max pressure?

 

depends on the type of load you are carrying.
if its mostly toungue wieght or trailer wieght.
if you have quite a bit of tounge wieght your pressure should be higher but ifs its pretty evenly distributed then i would say you are fine with whats in the tire without a load.
same goes for payload in your bed