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  #1  
Old 08-27-2015, 05:26 PM
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What Tire Pressures Do You Run?

I have Michelin Altitudes that have a max pressure of 44 PSI. I've never physically checked them yet. According to the dash display they are running between 39 and 41 PSI. I think tomorrow morning while it's cool, I fill them all to 44 PSI. I don't mind a firm ride, and running max pressure will give you the best fuel economy. What are your tires rated, and what pressure do you run in them?

Also, this is the first vehicle I ever had that has tire pressure monitors. How do they work? Does the valve stem send a signal to the car? I see a lot of the tire stores offer "rebuild kits" for them when you buy new tires. They're quite reasonable. Do they have a small battery?

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Old 08-27-2015, 05:44 PM
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Re: What Tire Pressures Do You Run?

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Originally Posted by billt View Post
I have Michelin Altitudes that have a max pressure of 44 PSI. I've never physically checked them yet. According to the dash display they are running between 39 and 41 PSI. I think tomorrow morning while it's cool, I fill them all to 44 PSI. I don't mind a firm ride, and running max pressure will give you the best fuel economy. What are your tires rated, and what pressure do you run in them?

Also, this is the first vehicle I ever had that has tire pressure monitors. How do they work? Does the valve stem send a signal to the car? I see a lot of the tire stores offer "rebuild kits" for them when you buy new tires. They're quite reasonable. Do they have a small battery?
There is a pressure sensor and a battery in the valve stem assembly.
The batteries seem to have a pretty good lifetime.

They seem surprisingly accurate, at least mine do, compared to two different
specialty gauges.
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Old 08-27-2015, 06:26 PM
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Re: What Tire Pressures Do You Run?

37 psi cold in my OEM Goodyears

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Old 08-27-2015, 07:12 PM
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Re: What Tire Pressures Do You Run?

I run my Summit at 38psi, the door label says 36psi. I personally would never run tires at the max rated PSI!! Not sure why you would even want to when the recommended PSI is right on the door. Maybe go a couple above if fuel economy is such a great concern that you are willing to drive on maxed out tires.
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Old 08-27-2015, 07:13 PM
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Re: What Tire Pressures Do You Run?

look in the drivers side door jam and it will tell you the best pressure to run when the tires are cold, max on the side of the tire is when you are carrying max load in the vehicle. you get best ride and best traction and also tire life by going by the sticker.
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Old 08-27-2015, 07:39 PM
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Re: What Tire Pressures Do You Run?

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Originally Posted by JTS97Z28 View Post
I run my Summit at 38psi, the door label says 36psi. I personally would never run tires at the max rated PSI!! Not sure why you would even want to when the recommended PSI is right on the door. Maybe go a couple above if fuel economy is such a great concern that you are willing to drive on maxed out tires.
First off, I would never go by what's on the door. I go by what's on the tire. The tire manufacturer made the tire, and they determine what the pressure is they should be run at. Jeeps run many different makes and models of tires. Not all of them take the same pressure. That pressure and weight can be easily and exactly determined by looking at the tire.

Second, out here in the desert, road temperatures can easily exceed 150 degrees on dark pavement in direct sunlight. Tires run hotter than hell. By running maximum recommended pressure the tire endures the least amount of sidewall flex. This allows the tire to run the coolest. What "maxes out" a tire is weight, not running at the highest recommended pressure. Most all tire failures come from under inflated tires, not over inflated. Lastly, you will always get not only the best fuel economy, but also the longest tread life by running tire pressures on the high side.
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Old 08-27-2015, 08:07 PM
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Re: What Tire Pressures Do You Run?

Not sure what you mean by "looking at the tire." If you mean looking up the recommended pressure by looking at information provided by the tire manufacturer, sure.

If you are talking about running the pressure literally shown on the tire sidewall, thats the maximum pressure, and thats a bad thing to do. If you fill it up to 44 PSI cold, and then go out for a long drive on any hot road, let alone in a desert, the tire will get hot and the pressure get even higher.

On the high side, I agree. At maximum, no. We run our 2014 WK2 at 38 PSI, which usually turns to 39 or 40 PSI after several miles of driving.
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Old 08-27-2015, 08:51 PM
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Re: What Tire Pressures Do You Run?

So ... If you go to your doctor and you get Rx do you go with what doctor recommends or you go with maximum dosage before Rx becomes lethal?

To me max tire pressure is like that: "Do not go above max or you are going to die". Doesn't mean that max is optimal.

The truth is that I don't believe whats on the door as well since like somebody said I don't think that can be optimal as well since you can be running any tire.

I take that number as a starting point and take it from there. What works for me is 38psi all around.


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Old 08-27-2015, 08:54 PM
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Re: What Tire Pressures Do You Run?

I run my tires at 37 psi cold which provides about 40-41 psi at highway speeds once they heat up. I'd never pump them up to 44 psi...that would likely lead to very uneven tire wear and potentially affect safety.
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Old 08-27-2015, 09:36 PM
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Re: What Tire Pressures Do You Run?

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Originally Posted by SouthDakota View Post
Not sure what you mean by "looking at the tire."
Molded right into the sidewall of every tire sold in this country is the Maximum Cold Inflated Pressure. This is the highest pressure the manufacturer recommends they be inflated to when checked COLD. They also post the maximum weight it is capable of being run at. It does not mean you are "in danger" running at that pressure or weight. If it did they wouldn't post it on the tire.

I've found in over 45 years of driving, running at or near the highest recommended cold inflated pressure gives the best fuel economy, and longest tread life. I have NEVER had a blow out, or uneven tread wear doing this in hundreds of thousands of miles of driving. This in temperatures from -21F in Chicago in January, to +128F in Lake Havasu City in June.

Quote:
Originally Posted by Roki303 View Post
So ... If you go to your doctor and you get Rx do you go with what doctor recommends or you go with maximum dosage before Rx becomes lethal?
This is a real stretch, but I'll play. If the doctor recommends the maximum dosage, which many times in my case he does, I take it, period. I'm 6'2" 230lb. I'll need more of whatever drug over the guy who is 5'7" 145lb. But this has nothing to do with tires.

There is nothing "lethal" or even close to "dangerous" you're going to encounter by running your tire pressure at the high side. About all you'll feel is a bit firmer of a ride. Which I like, especially in a big, high C.G. boat like the Jeep Grand Cherokee. It feels, handles, and corners a lot better.

High profile tires are far more spongy at lower pressures because of the tall sidewalls. Add that to a suspension that isn't exactly a Corvette in comparison, and lower tire pressures don't help the handling. If I remember correctly some years back, there was a big case involving rollovers in some high profile SUV's. Part of the cause was people running too low of a tire pressure. In extreme cases when the vehicle got sideways, this caused the sidewall to roll under, contributing to the vehicle rolling over. So in the case of high profile SUV's, if you want to gauge "lethality" on tire pressures, your playing far more dangerously with too low of a pressure, than you are running at maximum recommended pressure.
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Old 08-27-2015, 09:54 PM
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Re: What Tire Pressures Do You Run?

I should add when I brought my Jeep home from the dealer the day I bought it last April, the dash readout showed 43 PSI all the way around. (One might have been 42 PSI). That has since dropped off to 39 PSI and I think one is at 41 PSI. This was sitting in the garage "cold". That is assuming you want to call 95F "cold".

So all I'm talking about here is an additional 1 PSI over what they sold me the vehicle at. Nothing to get excited about.
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Old 08-27-2015, 10:51 PM
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Re: What Tire Pressures Do You Run?

37 psi cold works for me.
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