Tire pressure - JeepForum.com
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post #1 of 14 Old 08-04-2020, 02:19 PM Thread Starter
SmashleyTulsa
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Tire pressure

What tire pressure are you guys running on the street? 42 inch irok bias. SBC, sm465, np205, 1 ton axles

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post #2 of 14 Old 08-04-2020, 05:03 PM
Chrisnvegas
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20 psi.
A 3000 lb machine with LT rated tires needs testing (chalk test) to make sure the whole tread is touching the ground.

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post #3 of 14 Old 08-04-2020, 05:19 PM
gutthans
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I run 24 lbs. in my 33's...and yea, check for full patch contact...I use the sand footprint instead of chalk, but either seem to do.
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post #4 of 14 Old 08-04-2020, 06:22 PM
Boojo35
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Quote:
Originally Posted by Chrisnvegas View Post
20 psi.
A 3000 lb machine with LT rated tires needs testing (chalk test) to make sure the whole tread is touching the ground.
I would never let the chalk test be the final answer. Come on man..... You live in the desert.... What happened to infrared testing being the final answer?
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post #5 of 14 Old 08-04-2020, 07:19 PM
wizekrakr
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23 psi in 35 inch Toyo A/T's. 5.3L V8 up front, Dana 489 axles. Had it on a scale the other day and with me and a half tank of gas she weighed 4460 lbs.
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post #6 of 14 Old 08-05-2020, 12:08 AM Thread Starter
SmashleyTulsa
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Ok thank you guys.. I should probably hit some scales and check my weight as well
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post #7 of 14 Old 08-05-2020, 12:22 AM
timatoe
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post #8 of 14 Old 08-05-2020, 06:36 AM
Waternut
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Yeah I've been meaning to hit the scales with my Jeep as well. Bias ply tires have stiffer sidewalls than radials and you're likely going to need to run lower pressures than your friend on radials to get a similar tire squish. I run 38.5x14.5x15 bias ply TSL's and I have to run them at an almost worrying pressure. On the street at about 16-18 psi, I've got roughly a 75% contact patch on the tire at those pressures. I've run 10psi on the street before and honestly feel like it steers and handles better than 16-18psi. On the trail, I run 4 psi up front and 3 psi in the rear. The picture in the grass is 3-4 psi and the picture in my driveway is 16-18 psi.
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post #9 of 14 Old 08-05-2020, 08:44 AM Thread Starter
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I definitely need to get it checked
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post #10 of 14 Old 08-05-2020, 10:00 AM
Randonexplosion
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3,980 lbs on 40s and 20 psi feels right to me.


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post #11 of 14 Old 08-05-2020, 10:55 AM
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93 4.0 AX15 D30 D44 32in BFG I run at 20 PSI

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post #12 of 14 Old 08-05-2020, 10:21 PM Thread Starter
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Quote:
Originally Posted by Randonexplosion View Post
3,980 lbs on 40s and 20 psi feels right to me.
Okay that's closer to my size and what I was looking for, apparently everybody says 20 so I will go with that
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post #13 of 14 Old 08-07-2020, 09:28 AM
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Quote:
Originally Posted by SmashleyTulsa View Post
Okay that's closer to my size and what I was looking for, apparently everybody says 20 so I will go with that
It would be a good starting point but you will need to fine tune to your setup. My tires are only 12.5" wide.


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post #14 of 14 Old 08-08-2020, 09:14 AM Thread Starter
SmashleyTulsa
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Quote:
Originally Posted by Randonexplosion View Post
Quote:
Originally Posted by SmashleyTulsa View Post
Okay that's closer to my size and what I was looking for, apparently everybody says 20 so I will go with that
It would be a good starting point but you will need to fine tune to your setup. My tires are only 12.5" wide.
I'm at 14 wide
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