Tire pressure bias ply tires - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 6 Old 03-20-2011, 09:16 AM Thread Starter
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Tire pressure bias ply tires

Ok what psi is everyone running I got some pit bull rockers that just can't get to run right.


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post #2 of 6 Old 03-20-2011, 10:06 AM
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i ran 39x14.50-17 Pit Bull MadDogs and at first 30 psi and were rough. then 25 psi and 20 psi. still had a little uneven wear. then bumped it to 35 and 40 psi during the cross country dirves from KC to moab, vegas, sedona, big bend, daytona...felt good.

on the trail i run at 3-8 psi depending on terrain.


chalk them and see how it wears. make sure it is even across the chalk mark. that wil be your PSI setting.

ill post the pic of the chalk later. cant find it atm


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post #3 of 6 Old 03-20-2011, 10:33 AM
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Be careful of running them on the street too low. It will wear that tread down really fast. I run mine at 29psi. I tried higher and lower, but that seems the sweet spot for me.

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post #4 of 6 Old 03-20-2011, 11:34 AM
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I'm running 20PSI on the street. 39.5" bias Iroks. They round out if I run more than that.
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post #5 of 6 Old 03-21-2011, 04:48 AM
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Pit Bull tires are a soft compound and really stick to the slick rock (sandstone) like fly paper. i love the traction they provide. goon on the highways, rain or snow its good traction.

the sidewalls are think and stiff. even at 5 psi i dont flex much. thats the reason i run around 3-8 psi.

the chalk line is about 6" wide and across the tire. drive straight down about a block and check the chalk. look for even wear. once you find it then you found the street psi for even wear. you can adjust from there to improve the ride if you like. but keep in mind you will have uneven wear.

i always get 5 tires and rotate the spare in the mix. that way the spare is used, buy tires less often, plus if you need to use the spare its close to the rest. you dont have a brand new tire on with 3 tires that have 25k on them.

I found that pic. the Green chalk on the front tires.
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post #6 of 6 Old 03-21-2011, 05:14 AM
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I started my Creepy Crawlers at around 25, and they were pretty squirrelly at highway speed, looked like I was drunk. Then, dropped it to 20. Still a little goofy. Dropped again to 15 and things seem to be about right. Only running a 35x12.5x15. Stiff sidewalls on these buggers...

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