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Unread 07-20-2013, 10:20 PM   #1
rambo3489
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Let's talk tire pressure

Alright guys,

Long story short I caused a lot of trouble saying I ran my MTR/Ks at 14 psi. I just got them and that's what the chalk test said to run them at. Gave me full tread contact across the tires. I was then informed the chalk test is not the best tool to use with big tires on proportionally small wheels. OK. So I ran my tires at the PSI range that was suggested to me. (20-24 psi) This picture was with 20 PSI.

Well I just got back from a little light wheeling got some mud on the tires and made an interesting observation. The tires are only contacting on the center as I feared form the start. See:



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Unread 07-20-2013, 10:24 PM   #2
Anticanman
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That looks ok to me. The way the lugs are shaped, its not supposed to have full tread contact on the pavement all the time.
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Unread 07-20-2013, 10:35 PM   #3
dillonjm
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Quote:
Originally Posted by Anticanman View Post
That looks ok to me. The way the lugs are shaped, its not supposed to have full tread contact on the pavement all the time.
This.

Looks about right to me.
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Unread 07-20-2013, 10:40 PM   #4
rambo3489
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No kidding?! Alright thanks guys
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Unread 07-20-2013, 10:45 PM   #5
dillonjm
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Its going to even out eventually too. But that is about what i run mine at, new(ish).

Granted my WJ needs about 28-30lbs of pressure vs 20. Apples to oranges though, considering tire size, weight, tire load rating, etc.
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Unread 07-21-2013, 07:13 AM   #6
UltimatE
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This is how my chalk test ended up. The outside of the tread is also rounded on my KM2s, so there is still some chalk left on the outsides. Nothing to worry about.

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Unread 08-31-2013, 09:20 AM   #7
tom_sprecher
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I just installed 33 x 12.5 x 15 KM2's. What is a good starting pressure to do the chalk test?
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Unread 08-31-2013, 09:43 AM   #8
RockWoRM
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I think it's pretty safe to say forget the chalk test and just run them in the low/mid twenties... 22-24 and you'll be fine. YJ's are not that heavy and when running meats in the 33-35 flavor on your average 8" rim, that is about the right psi. Off road, drop 'em down to whatever you like. .o2



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Unread 08-31-2013, 10:51 AM   #9
Tom95YJ
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You guys dont wheel enough, Or your not wheeling properly your lugs are still in great shape, Mine are all cut and chunked from wheeling
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Unread 08-31-2013, 01:26 PM   #10
rambo3489
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Quote:
Originally Posted by Tom95YJ View Post
You guys dont wheel enough, Or your not wheeling properly your lugs are still in great shape, Mine are all cut and chunked from wheeling
... My picture was taken a week after I completed a frame off build, with a tranny without third gear. Cut me some slack.
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[URL="http://www.jeepforum.com/forum/f22/my-yj-build-adventures-thread-1356941/"][SIZE="3"][B]BUILDING THE YJ MY WAY[/B][/SIZE][/URL]
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