I've got 235/45/17 tires on 17/7.5 wheels. It says 35PSI maximum pressure, but it neither feels nor looks right. I adjusted it to 38PSI, and it feels already better. I know that low profile tires need higher pressure, so my question is how high can I safely go?

 

Sidewall should have it marked on it.

 

when i go to a shop they put it at 37 psi but it still doesnt look right. but i have 40s on my 17s because that was the deal.

 

You should never exceed the pressure marked on the sidewall of the tire. Ever.

Measure the pressure when the tire is cold.

I don't know how they decide tire pressures when plus sizing, but I would ask the shop. There should be a chart where they can look it up to see how much pressure over stock you should run I think. This isn't something that you should just do by "look"....

 

mine look flat like i said but i have the correct pressure so i am cool..it says i cant go higher than 43psi. Plus i dont want to go to high with the PSI cause it will make the ride more bumpy.

 

Not too mention overinflation causes the center of the tire to wear faster and has a SMALLER contact patch