PSI In Nitto Trail Grapplers? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 11 Old 03-23-2011, 12:51 PM Thread Starter
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Question PSI In Nitto Trail Grapplers?

Ive got 35 12.50 R17 Nitto Trail Grapplers and am not having any luck finding the sweet spot to run on the street. My JKU rides really rough after i put these on. Any suggestions on PSI? I know these are a stiff tire to begin with but was just wondering what anyone else does.
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post #2 of 11 Old 03-23-2011, 12:53 PM
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Try 25 front and 28 rear
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post #3 of 11 Old 03-23-2011, 01:14 PM
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Mine are 35-12.50-18's and i'm runnin 30 front and 28 rear but i have a winch and bumper. It seems to ride pretty well there.

2009 JK Unlimited - Deep Water Blue
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post #4 of 11 Old 03-23-2011, 03:07 PM
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28 psi all around here. Anything higher they are rough as hell on the street

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post #5 of 11 Old 03-23-2011, 03:07 PM
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Also 35x12.5r18's. Running 29 in front 28 in the rear. Not rough at all.


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post #6 of 11 Old 03-23-2011, 03:47 PM Thread Starter
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Thanks For The Replies. Im Gonna try the 25 28 PSI then work from there that atleast gives me a starting point.
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post #7 of 11 Old 03-24-2011, 11:05 AM
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28 all around on the JKU Rubi here running those. 35 road like bricks and 25 was a little squirrelly. Obviously weight distribution and what you've done is going to have that vary a bit.
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post #8 of 11 Old 03-24-2011, 11:35 AM
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I just lowered mine down from 65 to 30. Wow what a difference!
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post #9 of 11 Old 03-25-2011, 08:01 AM
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65!!!!!!!!! Holy Smokes, did you rattle your teeth loose.

2009 JK Unlimited - Deep Water Blue
Rough Country 2.5" Series II Budget Boost
18" XD Monsters w/ 35" Trail Grapplers
Superchips Flashpaq
KC windshield light brackets w/ KC slimlights
Rugged Ridge XHD Modular Winch Bumper
Smittybilt SRC8 Winch
Relocated Flowmaster Super 44 w/ offroad tailpipe
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post #10 of 11 Old 03-25-2011, 08:05 AM
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https://jkowners.com/forum/showthread.php?t=26903

USMCDOC14 did a really good write up on how to find your ideal PSI for larger tires...

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post #11 of 11 Old 03-25-2011, 08:43 AM Thread Starter
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Im now at 28 all around and it seems to help quite a bit. I know its weird but it made a pretty big difference. Anyone know what psi the factory tpms light goes off at?
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