Tire Pressure - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 9 Old 11-03-2010, 10:03 AM Thread Starter
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Tire Pressure

I searched and haven't found exactly my answer. I am running Nitto Mud Grapplers 35"x18"x12.5"

What is a good pressure? They are currently at 34lbs and wearing in the center, not wearing evenly.

Should I go lower? How much?

Any help would be appreciated.

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post #2 of 9 Old 11-03-2010, 10:06 AM
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yes, lower... great way to do it.. get some sidwalk chalk, mark the tire, drive straight on, middle wear before outside, lower pressure, outside wears first, raise it.

Are they D or E Load?

Seems 30PSI is a magic number (for me anyway) I always start there and usually am good leaving it there.


Every JK will be a little different tho depending on your rigs weight.

no jeep here...
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post #3 of 9 Old 11-03-2010, 10:13 AM Thread Starter
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Quote:
Originally Posted by Racer83l View Post

Are they D or E Load?
IDK. How do I tell??

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post #4 of 9 Old 11-03-2010, 10:15 AM
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Quote:
Originally Posted by SingleStack View Post
IDK. How do I tell??

Load range will be on the side of the tire.
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post #5 of 9 Old 11-03-2010, 10:17 AM Thread Starter
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Ahh. Looked to fast and didn't see it the first time.

They are E's. So what is the diff between E and D?

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post #6 of 9 Old 11-03-2010, 10:19 AM
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It'll take you a few minutes, but the chalk test is an easy way to of figuring out what PSI works on your JK.

YouTube - chalking your tires for better wear and performance
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post #7 of 9 Old 11-03-2010, 10:32 AM Thread Starter
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Chalk test it is. Thank's to everyone for the info!

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post #8 of 9 Old 11-03-2010, 10:36 AM Thread Starter
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So if I am correct, and E rated tire is a 10ply sidewall?

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post #9 of 9 Old 11-03-2010, 12:49 PM
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D load are light load tires, generally 8 ply with weaker sidewalls and slightly softer compound. E load are heavy load tires, generally 10 ply with stiffer sidewalls and harder compound. E load tires are especially important on diesel trucks - vehicles designed to tow heavy loads. Those trucks also start out very heavy 8000 - 9000 lbs.

Once you start mods on your Jeep and add armor, skid plates, roll bars, bigger (heavier) tires, E load tires may become necessary to deal with all the weight; but they may not have as good of performance off-road with sidewall flex as the D load counterpart.

As with all things Jeep, it is often a compromise to decide which load range you run. You can tinker with aspect ratio to help offset sidewall stiffness, but in my experience there are far fewer choices in off-road tires that have E load rating. If your rig is primarily a daily driver, and you've hogged it up with a lot of extra weight, E rated tires will likely help with mpg and last longer, whereas D rated tires will have much more "bounce" going down the road as the sidewalls flex more over little bumps, not helping the characteristic Jeep steering, accelerating tread wear, and uneven tread wear. If you wheel more and see less pavement, all those D rated flaws now seem more appealing and why some folks go to bias ply tires.

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