esmarkey

I have been keeping my tire pressure a bit above the factory recommended 32PSI. Between 34 and 38psi for better fuel mileage. The tire stated maximum pressure is 44psi.

My question: Is the tire maximum pressure for cold tires? In other words is it OK to inflate to 44psi in let's say 70 degree weather, and later that day it gets to 85 degrees, and you have just driven 100 miles at 75mph bringing the temp up to 50 psi?

I have never done this, but because of the TPM I have noticed how much pressure can increase with ambient temp and/or speed.

tireman1554

Yes. That is a cold rating and perfectly safe; However, it will ride like a tank and have more adverse affects on suspension components not to mention rapid tire wear.

08blackHHRSS

Yup, "cold" temp is pretty much first thing in the morning etc.
I've noticed prob 3-4 lbs PSI increase from driving, and a lotta times after it's been driven, it sometimes never gets back down to the "first thing in the morning " pressure, hence the deal about checking pressures after sitting overnite or whenever.

It's been said the proper pressure is what is posted on the door of a vehicle, and not what the tire maker says to have. The car maker's settings are for each particular model,based on ride and everything else tire pressure related, not what is showing on the tire itself .

esmarkey

I know, but us car guys always know better than the car manufactures

I would never increase mine beyond what the tire manufacture stated, just wanted to know as some of my other vehicles have less of a difference. I always tend to inflate a little over the vehicle manufactures recommendations as I am trying to get the best MPG. Usually somewhere in between.

If I am looking at pure performance, I inflate to the vehicle mfr recommendation or a little less.

The thing that surprised me now that I have the TPS is that this summer parked in the sun, the side that was in the sun can be 4 - 5 psi higher than the side in the shade. Usually evens out after a few miles of driving though.

wysguy

the pressure on the sidewall of the tire is the max you're supposed to inflate the tires to, and that would be under ideal conditions (i.e., carrying a heavy load, etc). I wouldn't recommend going over 40 for day-to-day driving, and you're still going to have a hard ride.

esmarkey

I understand about the rough ride, again I was just curious what the tire experts say.
My 3/4 ton truck tires say max weight rating is at max cold pressure of 75psi. I fill it to 75psi and pull 13,000lbs and they frequently go above 85psi. after a few hundred miles. Just wondering about the "max cold pressure" issue.

I generally run my SS front at 34psi and rear at 36psi in summer only, I run 32/32 in winter.

hyperv6

You might call General tire and ask them what they want in their tires LOL!!!

The dealer put 30 in mine all the way around and I was going to read them once I getr some miles on them. FWD tend to wear in the centers on the rear because all the weight is up front.

I run a few pounds less in the rear of my GTP to keep them wearing even. I would wexpect the same on the HHR. Now on my Fiero I run more in the rear because of more rear weight.

Either way 28-32 unloaded should be a good range.