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Old 04-13-2013, 05:53 PM   #1
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Tire pressure?

Curious... I'm running 33's(285/70/17's) Duratracs on my 12JK. I'm using the soft top with the backseat removed too, so it's a bit light on its feet. What is a good cold running tire pressure for a good on road ride? I've heard everything from 25 to 35 psi. I have been running between 28 and 30. Thank u in advance for any advice.

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Old 04-13-2013, 06:35 PM   #2
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Run 35psi and let it run down to 29 and air back to 35 etc............


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Old 04-13-2013, 06:36 PM   #3
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I like my 33"s Duratrac with 28PSI for my TJ
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Old 04-13-2013, 06:44 PM   #4
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Run 35psi and let it run down to 29 and air back to 35 etc............

1Topp's hedging his bets.

While I don't disagree with that strategy, I'll tell you that, on average, for a 33" aftermarket tire on a Wrangler, you want 30-32 PSI for optimum tire wear. That, of course, depends on the tire rating.

There are folks who will tell you to go higher for better mileage, but I'm not one of em. Run your tires at the PSI that'll make them last the longest, which in your case should be close to the figure above.
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Old 04-13-2013, 09:50 PM   #5
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Thank u for the replies!
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Old 04-13-2013, 09:59 PM   #6
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I have run my 35's at all tire pressures and while lower tire pressures offer a cushier ride, I prefer a tire pressure close to 35 because the handling feels better.
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Old 04-14-2013, 09:23 AM   #7
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I adjust my pressure by how the contact patch looks on the tire. You can see it if you drive through some dust or water. Also take a look at the tire and see how flat the tread looks. Hollow in the center, to much air. Tread crowned, not enough. My stock Bridgestone 18" duelers are set to 30psi all the way around. The last set went 45k miles.
Jeep would have you have more than needed to eek out any MPG benefit.
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Old 04-14-2013, 09:42 AM   #8
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I adjust my pressure by how the contact patch looks on the tire. You can see it if you drive through some dust or water. Also take a look at the tire and see how flat the tread looks. Hollow in the center, to much air. Tread crowned, not enough. My stock Bridgestone 18" duelers are set to 30psi all the way around. The last set went 45k miles.
A handy variation on the chalk test.

Some scoff at it, but if you want the longest life outta your $200 tires...


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Jeep would have you have more than needed to eek out any MPG benefit.
Normally I do all the work on my Jeep, but a few weeks ago I had a seatbelt that was locking up (couldn't pull it out without it sticking) and took it into the dealership. On the way home I noticed it was riding like crap. Sure enough, they'd jacked my PSI up to 36.
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Old 04-14-2013, 07:30 PM   #9
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Originally Posted by kbwwolf View Post

A handy variation on the chalk test.

Some scoff at it, but if you want the longest life outta your $200 tires...

Normally I do all the work on my Jeep, but a few weeks ago I had a seatbelt that was locking up (couldn't pull it out without it sticking) and took it into the dealership. On the way home I noticed it was riding like crap. Sure enough, they'd jacked my PSI up to 36.
It's weird because Discount Tire upped my pressure to 35 and I like it. A little rough in some patches, but handles much better than 26-28. I might settle around 34 front and 32 rear.
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Old 04-14-2013, 07:37 PM   #10
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Originally Posted by kbwwolf View Post

1Topp's hedging his bets.

While I don't disagree with that strategy, I'll tell you that, on average, for a 33" aftermarket tire on a Wrangler, you want 30-32 PSI for optimum tire wear. That, of course, depends on the tire rating.

There are folks who will tell you to go higher for better mileage, but I'm not one of em. Run your tires at the PSI that'll make them last the longest, which in your case should be close to the figure above.
2 mechanics told me 30 psi for optimum wear. People forget to consider wear...
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Old 04-14-2013, 07:38 PM   #11
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After 7,500 miles, my KM2's have worn perfectly thus far at 30 psi...
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Old 04-14-2013, 07:50 PM   #12
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Originally Posted by DallasJKU View Post
It's weird because Discount Tire upped my pressure to 35 and I like it. A little rough in some patches, but handles much better than 26-28. I might settle around 34 front and 32 rear.
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2 mechanics told me 30 psi for optimum wear. People forget to consider wear...
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After 7,500 miles, my KM2's have worn perfectly thus far at 30 psi...

Bam!

Chief nailed it.

You have a choice with your tire pressure.

1. Longevity. Max tire wear. Preserving that $1K or so you spent on rubber. Which is, almost entirely, what my recommendation for PSI is based on.

2. Mileage. You want better mileage, run a higher PSI. Problem there is, your tires are almost certainly overinflated. They'll wear in the center faster, and you'll need to replace em sooner. Somebody from MIT or CalTech tell me if that's more cost efficient, cuz I suck at math...

Also, running too high a PSI can make your Jeep feel flighty or jerky on the highway, which is the same symptom that indicates poor caster. Just sayin...

I opt for choice #1 with my tires. No right or wrong to it, I guess. Just figure out which one's more important to you.
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Old 04-14-2013, 07:54 PM   #13
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Bam!

Chief hit the proverbial nail on the head.

You have a choice with your tire pressure.

1. Longevity. Max tire wear. Preserving that $1K or so you spent on rubber. Which is, almost entirely, what my recommendation for PSI is based on.

2. Mileage. You want better mileage, run a higher PSI. Problem there is, your tires are almost certainly overinflated. They'll wear in the center faster, and you'll need to replace em sooner. Somebody from MIT or CalTech tell me if that's more cost efficient, cuz I suck at math...

I opt for choice #1 with my tires. No right or wrong to it, I guess. Just figure out which one's more important to you.
Yeah, people get consumed with gas mileage, yet they then have to replace their tires thousands of miles sooner... That said, all the while, they could have been enjoying a somewhat better, more supple ride quality.
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Old 04-14-2013, 08:03 PM   #14
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Yeah, people get consumed with gas mileage, yet they then have to replace their tires thousands of miles sooner... That said, all the while, they could have been enjoying a somewhat better, more supple ride quality.
Supple?

Okay, so I had to take my Jeep into the dealership recently for a seatbelt issue. Normally do all my own maintenance, but hey...

On the ride home, which is 90% freeway, it handled awful. Wandering all over the place. Sure enough, they'd jacked my tires up to 36 PSI. Only about 5 PSI over what I normally run, but man, it was VERY noticeable...

Not supple at all, if you know what I mean.
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Old 04-14-2013, 08:42 PM   #15
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Supple?

Okay, so I had to take my Jeep into the dealership recently for a seatbelt issue. Normally do all my own maintenance, but hey...

On the ride home, which is 90% freeway, it handled awful. Wandering all over the place. Sure enough, they'd jacked my tires up to 36 PSI. Only about 5 PSI over what I normally run, but man, it was VERY noticeable...

Not supple at all, if you know what I mean.
People think lowering pressure 5 lbs is nothing, but it will give the Jeep a better ride...
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Old 04-14-2013, 09:01 PM   #16
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I have 275/70r18s duratrac tires on a stock 13 jk. Discount tires said to run it at 40psi. Any recommendations on what I should run it at? Or should I just do the chalk test n hope that I do it correctly....
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Old 04-14-2013, 09:08 PM   #17
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People think lowering pressure 5 lbs is nothing, but it will give the Jeep a better ride...
Very true.

It can be the difference between, say, supple, and...hmm. Not supple?

Okay. My bad. I'm breaking your stones and I feel like dirt. Kind of. In any event, I'll most likely sleep hard tonight; you can take pleasure in that.

Hope you feel superior for picking on me, Chief!
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Old 04-14-2013, 09:16 PM   #18
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I have 275/70r18s duratrac tires on a stock 13 jk. Discount tires said to run it at 40psi. Any recommendations on what I should run it at? Or should I just do the chalk test n hope that I do it correctly....
My feud with Chief aside (who, I hope you'll note, attacked me savagely and quite unfairly)...

A general rule is this: 33" tires, run 30-32 PSI. For 35s, 28-30 PSI. Those are starting points. There are a lot of variables that play into it...weight of your Jeep, driving style, whether or not you air for mileage or tire longevity, etc.

For me, based on preserving my tires, I run 31 PSI in my 35", E-rated DuraTracs. Be aware, the E designation changes things drastically. Generally speaking, for your tire size you're gonna want about 32 PSI...I'd start there, and lower it or raise it depending on your preferences.

40 is way too high. Not sure what their reasoning is for that...
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Old 04-14-2013, 09:26 PM   #19
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Bam!

Chief nailed it.

You have a choice with your tire pressure.

1. Longevity. Max tire wear. Preserving that $1K or so you spent on rubber. Which is, almost entirely, what my recommendation for PSI is based on.

2. Mileage. You want better mileage, run a higher PSI. Problem there is, your tires are almost certainly overinflated. They'll wear in the center faster, and you'll need to replace em sooner. Somebody from MIT or CalTech tell me if that's more cost efficient, cuz I suck at math...

Also, running too high a PSI can make your Jeep feel flighty or jerky on the highway, which is the same symptom that indicates poor caster. Just sayin...

I opt for choice #1 with my tires. No right or wrong to it, I guess. Just figure out which one's more important to you.
Great post!
I run 30psi on 35in pro-comp mt/mt2's
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Old 04-14-2013, 09:34 PM   #20
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My feud with Chief aside (who, I hope you'll note, attacked me savagely and quite unfairly)...

A general rule is this: 33" tires, run 30-32 PSI. For 35s, 28-30 PSI. Those are starting points. There are a lot of variables that play into it...weight of your Jeep, driving style, whether or not you air for mileage or tire longevity, etc.

For me, based on preserving my tires, I run 31 PSI in my 35", E-rated DuraTracs. Be aware, the E designation changes things drastically. Generally speaking, for your tire size you're gonna want about 32 PSI...I'd start there, and lower it or raise it depending on your preferences.

40 is way too high. Not sure what their reasoning is for that...
Dude, all is forgotten. I'm sorry. We're cool in my eyes...
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Old 04-14-2013, 09:45 PM   #21
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Dude, all is forgotten. I'm sorry. We're cool in my eyes...


Sorry. I make my living from conflict, and when I'm not in the thick of it, I sometimes feel the need to manufacture it.

However, with posts like that from 12abbit, who needs to make things up? I mean, did you notice how he dissed us both?

I'm thinking about slinging some lead...
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Old 04-14-2013, 09:57 PM   #22
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Sorry. I make my living from conflict, and when I'm not in the thick of it, I sometimes feel the need to manufacture it.

However, with posts like that from 12abbit, who needs to make things up? I mean, did you notice how he dissed us both?

I'm thinking about slinging some lead...
Lol
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Old 04-14-2013, 10:09 PM   #23
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Discount just mounted up my 285-7-17's and told me 40 as well. Rides like crap and is flighty.

Edit: They didn't do 40 - they put in 45! I just dropped it to 34 to start my chalk test tomorrow. That should feel better!
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Old 04-14-2013, 10:17 PM   #24
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Discount just mounted up my 285-7-17's and told me 40 as well. Rides like crap and is flighty.
My buddy told me they are mandated to do that... It's a cya move... And it's true bcuz I just had mine done there last week and actually told the guy 30, and he told me they're not allowed to do that due to liability.
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Old 04-15-2013, 06:56 AM   #25
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As you can see, everyone runs it a little differently. Do the chalk/dust/water test yourself and figure out the best PSI for your setup. Mine currently lacks a rear bumper/tire carrier and I run 26 up front and 24 in the rear. 26 = over inflated with the current weight distribution.

My tires are rated E, and are 37s, but my point is you need to figure out what's best for you on your own.
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Old 04-15-2013, 04:41 PM   #26
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Originally Posted by kbwwolf View Post

My feud with Chief aside (who, I hope you'll note, attacked me savagely and quite unfairly)...

A general rule is this: 33" tires, run 30-32 PSI. For 35s, 28-30 PSI. Those are starting points. There are a lot of variables that play into it...weight of your Jeep, driving style, whether or not you air for mileage or tire longevity, etc.

For me, based on preserving my tires, I run 31 PSI in my 35", E-rated DuraTracs. Be aware, the E designation changes things drastically. Generally speaking, for your tire size you're gonna want about 32 PSI...I'd start there, and lower it or raise it depending on your preferences.

40 is way too high. Not sure what their reasoning is for that...
I have E-Rated tires will I still go with 30-32 psi? And what's the difference between E-rated n a non E-Rated tire as far as the psi?
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Old 04-15-2013, 05:13 PM   #27
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^x2... I just got 285/70r17's put on. Aired them down from 40psi to 32psi. I'm after preserving my new tires the best I can.
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Old 04-15-2013, 06:30 PM   #28
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2012 Jk Wrangler S with hard top. TF leveling kit (if that matters) and 33x12.5x15 DuraTracs. OEM bumpers. I started at 32 psi and did the "dust test" and "chalk test" multiple times as well as checking for wear across the tread at each 5k mile rotation. After 9 months I have settled on 28 psi for my JK. This provides even wear given the wt of our Jeep.

Hope this helps.

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Old 04-16-2013, 12:12 AM   #29
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Thank u all for the help. I have had them on for over 15K miles now, but I always run em a bit different each time I air them up or down. I've tried 33, 30 and 28. I'm going to stick with 30. Thanks again!
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Old 04-16-2013, 11:27 AM   #30
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Just received my new wheelset from DTD last night. 285/70/17 on XD Addicts. They were set to the max pressure that the tire manufacturer states. And they put a nice little yellow sticker on each tire indicating just that.

I figured they would come that way anyway and probably max it out to make sure the seating is good for the balancing. I actually appreciate that. Ill start with 32 and see how it rides and make adjustments from there.

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