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Old 11-19-2011, 11:30 AM   #1
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Goodyear DuraTrac pressure?

I just had 4 new 33 x 12.5 x 15" Goodyear DuraTrac tires installed on my Jeep yesterday by a local Goodyear dealer.

When I picked my Jeep up, I asked the manager how many pounds of pressure they put in the tires. He told me 40. I told him that I had read on this forum that I shouldn't run more than 28 psi. He said that was way too low, that these tires are 6 ply light truck tires and need a higher pressure.

There are a lot of real knowledgeable Jeep people on here. What do you think? 40 pounds or 28? I will say this, my ride home from work last night was very smooth! This is a daily driver, mostly highway miles, hardtop and 5 speed, no winch, Hanson front and rear bumpers and usually just me in it.

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Old 11-19-2011, 11:45 AM   #2
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That guy is totally clueless, he doesn't deserve to manage a tire shop. The bigger or stiffer the tire is under a given weight vehicle, the less pressure it requires. For your 33x12.50 tires, 26-28 is appropriate. 26 lightly loaded, 28 fully loaded will work well for the street.

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Old 11-19-2011, 11:50 AM   #3
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Considering that max pressure for that tire is 35#, that guy is an idiot. I have them and run 28#. I tried at 33, but the ride was way too rough.
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Old 11-19-2011, 11:51 AM   #4
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I've had the best luck around 28psi like Jerry said. That guy has no idea how much your jeep weighs or how much pressure it needs for that tire.
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Old 11-19-2011, 12:05 PM   #5
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28 on the road. Mine ride great at that pressure.
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Old 11-19-2011, 12:44 PM   #6
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Thanks for your help. I trust you guys much more than that manager. I'm dropping the pressure to 28 psi today.
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Old 11-19-2011, 12:55 PM   #7
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Running 26 psi in my 33"s. At least discount tire only put 33 psi in them to Begin with. It road rough even at that. Can't imagine any more.
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Old 11-19-2011, 01:32 PM   #8
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Been running 28 in mine and that seems to be the best.
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Old 11-19-2011, 02:46 PM   #9
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How about 31 x 10.50 x 15's? I've been running 28psi since I got them this summer. It looks like everyone runs this pressure with 33's. Should I be running more pressure with a smaller tire?
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Old 11-19-2011, 02:48 PM   #10
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For 31" tires, 30-31 psi is about right. 30 most of the time, maybe 31 for a little heavier load or the highway.
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Old 11-19-2011, 03:02 PM   #11
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Thanks Jerry, I try 30 and see how it feels.
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Old 11-19-2011, 03:03 PM   #12
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It baffles me how it gets screwed up every time. Doesn't matter what vehicle. It always seems like 3 tires are filled to max pressure and one is way off. I always take a torque wrench and pressure gauge with me, not just for tires, but for inspections too. A couple places that I used to swear by around here have boned me lately. Wheels put back on hand tight, wrong lugs, wrong air pressure, busted center caps, and some jackass at the only modified inspection station near here that ran my lugs back on by air impact NASCAR style that stripped out 6 of my lugs/studs. Guess this could be a whole different thread...
Point is, most places don't care or know. If they do, they want you to wear out the center of your tread fast so you buy more often. And in my case, when you think you've found that nice mom and pop shop you can recommend, don't trust them. Checking them before you leave is better than having a wheel come loose a mile from the shop, ask my wife... Just had to get those new tires on her new car while I was at work... Well, she got new wheels now, and I had to work a few days of overtime to pay for it.
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Old 11-19-2011, 03:08 PM   #13
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The best shops are often screwed over by mechanics who think they know better than what they are told by their bosses or just don't care. I am aghast at what some so-called experienced mechanics have tried to pass off on me as fact over the years when in fact it was totally wrong or even pure BS. Air pressure and lug nut tightness are two good examples.
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Old 11-19-2011, 03:26 PM   #14
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Im going out right now and lowering my pressure...... WF is a wealth of knowledge.
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Old 11-19-2011, 03:31 PM   #15
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I have 33x12.50x15 Duratracs.

Goodyear inflated them to 35 lbs, and it was clear that only the very center of the tire was making contact. I dropped them to 30, and then to 27, and finally to 25lbs. Every pressure drop has improved the contact patch and the ride quality. I've left them at 25lbs.
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Old 11-19-2011, 03:33 PM   #16
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Im going out right now and lowering my pressure...... WF is a wealth of knowledge.
Search an thou shall receive... Lol
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Old 11-19-2011, 03:35 PM   #17
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Relying strictly on the contact patch, like is often done when the "chalk test" is used, will usually result in an underinflated tire. I'd have to say 25 is a bit low for a 33x12.50 tire holding a vehicle up with the weight of a Wrangler.
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Old 11-19-2011, 03:37 PM   #18
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Quote:
Originally Posted by BalefireX
I have 33x12.50x15 Duratracs.

Goodyear inflated them to 35 lbs, and it was clear that only the very center of the tire was making contact. I dropped them to 30, and then to 27, and finally to 25lbs. Every pressure drop has improved the contact patch and the ride quality. I've left them at 25lbs.
Yep. X2. Even been to 24lb. Love your Avitar by the way. Are those 1806 Harpers Ferry's? First gun commissioned by military police I think. I got one a few years ago, love it.
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Old 11-19-2011, 03:48 PM   #19
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Quote:
Originally Posted by Jerry Bransford
Relying strictly on the contact patch, like is often done when the "chalk test" is used, will usually result in an underinflated tire. I'd have to say 25 is a bit low for a 33x12.50 tire holding a vehicle up with the weight of a Wrangler.
I'm going by tire wear. I used to use the "chalk test" as a starting point, I know you've told me other wise, and I can understand why. I've run 33x12.5R15's for a decade now and start out at 27 front 26 rear and watch the tread. I usually end up dropping a lb or 2 as the center always wears faster and I'm afraid to go lower for Saftey reasons. If I'm towing something, I'll add a couple lbs to the rear. Of course, I have about 5 different pressure gauges, and every one reads a little different, so what's a lb or 2. I think we all have the right idea.
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Old 11-19-2011, 04:45 PM   #20
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Another thing when it comes to air pressure..Always check the pressure in the morning or evening when it is cooler outside..Don't check it after driving it.. The air pressure can expand and show a few pounds off on the tire gauge..

A lot of shops will pull a car in when the customer just drove 30 miles in the heat of the day and adjust the air pressure..Then the next morning that person drives it to work and wonders why the car drives bad..
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Old 11-19-2011, 04:49 PM   #21
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True. Air is a gas, and expands under pressure or when heated. Good point.
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Old 11-19-2011, 05:22 PM   #22
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Quote:
Originally Posted by HarryJeepGuy

Yep. X2. Even been to 24lb. Love your Avitar by the way. Are those 1806 Harpers Ferry's? First gun commissioned by military police I think. I got one a few years ago, love it.
How's this for a poser shot? Off topic, but nothing wrong with a little gun porn right? Either way, happy belated Vereran's Day.
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Old 11-20-2011, 06:07 AM   #23
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Hmm... the formula I've seen floating around Jeep forums is:

Step 1 - Multiply the max load times 4. This is the maximum weight your four tires can safely carry.

Step 2 - Divide the weight of the vehicle by the number you got in the first step. This is the percent of the max load you are actually carrying on the tires.

Step 3 - Multiply the psi stated on the tire for max load by the percentage you got in step 2. The result is the PSI for full tread contact.

Duratrac 33x12.50x15s are rated for 2,205lbs at 35psi, so:

Maximum load is 10,020lbs @ 35 PSI .
A Wrangler at 4400lbs is 44% of the maximum load.
44% of 35 PSI is 15.4 PSI.

If this formula is right (and it makes sense, assuming the relationship between load and tire pressure is linear), to exceed the load rating at 25 PSI you'd have to have a 7200lb TJ!

I wouldn't run 15 or 16 PSI on the street, but right now, at 25 PSI, the outer 3/4 inches of rubber on both sides of the tire do not make contact with the road. I think a balance has to be struck between ride quality, contact patch/tire wear, and safety.


PS. Yes, those are Harper's Ferry Model 1805 Flintlock Pistols. Not just the first for MPs, they're the first pistol of any sort designed for the US Military and produced at a national armory. Originals are massively expensive now!
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Old 11-20-2011, 07:54 AM   #24
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Quote:
Originally Posted by BalefireX View Post


I wouldn't run 15 or 16 PSI on the street, but right now, at 25 PSI, the outer 3/4 inches of rubber on both sides of the tire do not make contact with the road. I think a balance has to be struck between ride quality, contact patch/tire wear, and safety.
You have to keep in mind the wheel width the tire is mounted on affects the contact patch as well.... an 8" wheel with a 12.5" tire is going to be under inflated if the tread touches edge to edge...

And OP, do yourself a favor and go outside and read the sidewall of your new tires. Then go and explain to the tire shop manager that Duratracs come in different load ranges and sidewall thicknesses. You might save the next guy's life.
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Old 11-20-2011, 01:19 PM   #25
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You have to keep in mind the wheel width the tire is mounted on affects the contact patch as well.... an 8" wheel with a 12.5" tire is going to be under inflated if the tread touches edge to edge...

That's a good point. I'm running 15x10s, but I'm sure not everyone is.
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Old 11-20-2011, 01:27 PM   #26
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Quote:
Originally Posted by BalefireX

That's a good point. I'm running 15x10s, but I'm sure not everyone is.
I think most people run a 15x8 wheel. I've never actually seen a duratrac on a 15x10, got any pics?
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Old 11-20-2011, 03:54 PM   #27
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Just another thought. These duratracs are a commercial on/off road tire. Ideally suited for 3/4 ton -1 ton truck's, vans, stake bed's, our jeeps are a bit light for what they were designed for. I can't see a need for any D or E load tires on jeeps, ever. A commercial tire is going to need less psi to get a comfortable ride, not necessarily the correct psi for that tire. I run BFG A/T ko's, a softer compound tire, and anything under 30 psi and I have major tire roll.

Psi is relative to the tire, and what it was made for, and what it's on
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Old 11-20-2011, 09:52 PM   #28
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Thanks again for all your input. I dropped the pressure to 28 psi yesterday and it rides great. The tires are on 15 x 8 Black Rock steel wheels.

This forum is a great service with some really nice people on it.
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Old 11-20-2011, 10:42 PM   #29
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So 31 BFG ALL TERRIAN for a stock rim 15x8 should be ??? 32 I'm guessing ??
Appreciate the input my buddy who's a mechanic an avid jeeper told me 35 psi??
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Old 11-20-2011, 10:57 PM   #30
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Duratracs as well as many other tires are available in different load ranges. You have to read the fine print to know what you're buying. Some are only available in certain wheel sizes.

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