Im getting new tires today and was wondering what tire pressure should i be running. The factory psi or higher?

225/45/17
255/40/17

 

Factory.

 

even going up in size?
thanks in advanced!!

 

Yeah. I run 245/40/17 fronts and 255/40/17 rears and still do factory PSI. You don't have to set them at a hirer PSI because it naturally takes more air to get to 32 PSI (Whatever factory is I think its 32) in a larger tire than a smaller one. Make sense?

 

it does thanks for the quick responses on my threads I feel like a noob! lol

 

No problem. Just at work not feeling like working lol.

 

Yup. Consider that PSI means: pounds/square inch which is force/area. If you're at 32 PSI stock and you increase the area the force has to increase to keep the same PSI.

You don't even need experience. It's just math.

 

You should to use the pressure in tire which is recommended from the factory because they know well but if you have a rough road so you can adjust the pressure as per your need.