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Unread 05-14-2013, 05:20 AM   #1
NotmyJK
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Street tire pressure for 35x14.5x15 tire

Just bought a set of 35"x14.5"x15" Nitto Mud grapplers and did the chalk test. To get complete contact with the road they are set to 24 psi. Is this too low of a pressure to run on pavement? The Jeep weighs right at 4000 lbs and the tires are mounted on 15"x10" wheels.

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Unread 05-14-2013, 08:01 AM   #2
222Doc
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I run about 26 and have in hurry only aired up to 20ish , down the freeway for hours at 75. no issues with my MTRk's. But its up to you.
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Unread 05-14-2013, 06:46 PM   #3
CJ7nvrstk
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You'll be fine. With both Swampers and Toyos I had to run in the low 20s with no issues at all.
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Unread 05-14-2013, 06:52 PM   #4
CJ7nvrstk
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Quote:
Originally Posted by 222Doc
I run about 26 and have in hurry only aired up to 20ish , down the freeway for hours at 75. no issues with my MTRk's. But its up to you.
So you're saying on another thread that at 26 your Jeep is less stable yet you ran it at 75 MPH for several hours? Wouldn't it have been even more unstable then and put yourself and others in danger? Just sayin'.....
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Unread 05-15-2013, 11:28 AM   #5
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There is always someone who thinks the sky is gonna fall over a reduced psi in a tire on the highway. It usually comes down to the fear that the sidewall flex will overheat the tire and it will blowout, blah, blah, blah.

The sidewalls of a tire are made to flex. They do it on every revolution of the tire. I have felt the sidewalls of tires running at low pressure. Not even warm. Try it, you will see. Now, I suppose that a C rated rear tire of some passenger car with a 1500 trailer tongue on it and running at 15 psi, might burn up. Possible.

But all of this nonsense about the tire pressure being some critical factor other than tire wear is just silly. The major concern I have about tire pressure is that the wrong pressures cause understeer and oversteer and most morons cannot handle either. Hence, danger.
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Unread 05-15-2013, 12:18 PM   #6
222Doc
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Quote:
Originally Posted by CJ7nvrstk View Post
So you're saying on another thread that at 26 your Jeep is less stable yet you ran it at 75 MPH for several hours? Wouldn't it have been even more unstable then and put yourself and others in danger? Just sayin'.....
26 -27 max on the steet. With my set up and many MANY jeepers i know. I have ran less, not that i do, one time i had an emergency call and had to leave in a hurry. went to 20 from 9

Side wall stability is a ratio of sidewall height/ rim width and PSI. This might be to much for you to understand. Lets look at it like this. A 35" tire on 22"s, might be nomal out in Tx. Has LESS sidewall and those tires have higher psi. they must go on a widder rim. They have more sidewall stability. NOw compare to say a 35" on a 15" it has MUCH more side wall and by nature is LESS stabile. depending on rim width it may have from anywhere from 25-32 psi if C rated. Might be rocket science to you not sure.

At least I do not say or even think my JKU is a LOTUS in the curves. Nor do I ever drive it as such.
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Unread 05-15-2013, 04:10 PM   #7
CJ7nvrstk
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Quote:
Originally Posted by 222Doc
26 -27 max on the steet. With my set up and many MANY jeepers i know. I have ran less, not that i do, one time i had an emergency call and had to leave in a hurry. went to 20 from 9

Side wall stability is a ratio of sidewall height/ rim width and PSI. This might be to much for you to understand. Lets look at it like this. A 35" tire on 22"s, might be nomal out in Tx. Has LESS sidewall and those tires have higher psi. they must go on a widder rim. They have more sidewall stability. NOw compare to say a 35" on a 15" it has MUCH more side wall and by nature is LESS stabile. depending on rim width it may have from anywhere from 25-32 psi if C rated. Might be rocket science to you not sure.

At least I do not say or even think my JKU is a LOTUS in the curves. Nor do I ever drive it as such.
I'm not too sure where you get the idea that we run 22's in TX as I never stated anything of the sort. I can say though that reading is fundamental and you may want to work on that. Seems pretty clear to me that you have the last "s" in the KISS principle down to a T. I do fully understand stability but it is quite clear to me that your are still unable to grasp the concept of leverage and force exerted on a lifted vehicle, regardless of wheel size. Stay on the bunny slopes, just sayin. In the event you were unable to grasp that, stay in the shallow end, same principle.

BTW, I never said my Jeep is a Lotus. Reading is fundamental, I will try to say things straightforward so as not to confuse you since it is clear to me you have difficulty with comprehension.

Back on topic, sorry OP, I just have to call BS when I see it.
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Unread 05-15-2013, 09:38 PM   #8
222Doc
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You are so full of BS i can smell it from here. I have no idea what your trouble is. I wheel with a few local clubs we mainly run hard trails 4s here in az. I drive this Jeep i have now thousands of miles from the Rubicon to moab and back. matter of fact me and a few friends are going to Big bear and see what they have up there in the hard core range for 4 days starting tomorrow.

sleep well princess.
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Unread 05-16-2013, 04:36 AM   #9
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Quote:
Originally Posted by CJ7nvrstk View Post

Back on topic, sorry OP, I just have to call BS when I see it.
Lol! No problem. I got my answer and the rest is entertainment value

To get off track further, five 33x13.5s and five 35x14.5s will fill up a full size truck longbed. This was taking them in to get my wheels switched over.

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Unread 05-16-2013, 04:54 AM   #10
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Quote:
Originally Posted by NotmyJK View Post
Lol! No problem. I got my answer and the rest is entertainment value

To get off track further, five 33x13.5s and five 35x14.5s will fill up a full size truck longbed. This was taking them in to get my wheels switched over.

Nice! Have any pics of em on your Jeep yet? Needing some Jeeporn this morning.
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Unread 05-16-2013, 05:19 AM   #11
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They look small sitting next to the 40s on the Deuce. Lol!
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Unread 05-16-2013, 06:46 PM   #12
CJ7nvrstk
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Nice lookin rig.
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Unread 05-16-2013, 10:49 PM   #13
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Jealous that he's got a Jeep and a Deuce-n-half!
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