tire pressure Nitto 33's trail grappler - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 9 Old 09-29-2014, 06:30 AM Thread Starter
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tire pressure Nitto 33's trail grappler

I have a 2 door 08, on the tire it says 80 PSI Max, I just put them up to 65 PSI, What are yall running in them. I do a lot of HWY miles.
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post #2 of 9 Old 09-29-2014, 06:53 AM
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WOW! That thing has to ride like a lumber wagon at that pressure. I am running my 35" Toyos right around 30psi.

I would imagine you have to be running right in the center of the tread. Have you noticed if the jeep is darty now?
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post #3 of 9 Old 09-29-2014, 07:01 AM
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Holy sweet mother of god. The number on the sidewall isn't the recommended pressure, that's the MAX pressure. I run my Mickey Thompson tires at 32 psi.

That said, your tires should be around 30, probably. Best way to figure out what your pressure should be for optimal tire wear is to grab a piece of sidewalk chalk, draw a line across the front tires and make a couple of revolutions. If the chalk wears in the middle, the tires are over inflated. If the chalk wears on the sides, it's under inflated. Keep experimenting until you have an even wear across the entire tread block of the tire.

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post #4 of 9 Old 09-29-2014, 07:02 AM Thread Starter
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I have not noticed but have not got over 35 MPH yet. I think I am going to drop them back down to 40. I am leaving tomorrow on a 400 mile road trip.
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post #5 of 9 Old 09-29-2014, 07:04 AM Thread Starter
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The max on my sidewall is 80PSI
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post #6 of 9 Old 09-29-2014, 07:10 AM
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32 PSI on my BFG AT's
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post #7 of 9 Old 09-30-2014, 04:04 AM
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Quote:
Originally Posted by capt surf View Post
I have not noticed but have not got over 35 MPH yet. I think I am going to drop them back down to 40. I am leaving tomorrow on a 400 mile road trip.
Even 40 is too high. Do the chalk test. You'll probably be around 32.

2011 Sahara Tan 2dr Rubicon
Rock Krawler Stock Mod w/ Fox Evolution 2.0's - 36 X 12.5 X 15" Interco TSL's on Black Steel wheels - Rock Krawler track bars front and back - Poison Spyder Customs BFH front bumper w/ Brawler bar - Warn HS9500i winch w/ synthetic rope - Trail Head Deflators - Viair 440P Compressor Instagram: jeepethan
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post #8 of 9 Old 10-01-2014, 12:56 PM
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I run 28 psi in my Nitto Trail Grappler 35's
Chalk tested.
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post #9 of 9 Old 10-09-2014, 06:14 PM
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I'm not running the same tire as you, but when I installed Cooper Discovery STT's on mine about 45k miles ago, I chalked mine and am running 25 psi in them. I check the tread depth every 5k miles when i rotate them and they are wearing perfectly flat across the width of the tread. Every tire may be different, and would recommend the chalk test as mentioned previously.

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