Tire Pressures
12-29-2009, 06:06 AM
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Tire Pressures
Hey everyone the tires I am going to be putting on my jeep here in a day or so (after lift is finished). They are Mickey Thompson Baja ATZ Radial 35x12.5x17 Load D range. I called Mickey Thompson last week to ask what tire pressure they would recommend with my rig/weight for even tread wear. They said 30 psi. Is what they would recommend. I also asked them about airing down for trail riding or snow etc. They said 25 psi which I thought was pretty high considering some of the numbers I've seen you guys say. So here is my Q's. What do you guys think about the correct tire pressure for that setup?
Highway driving 30 psi?
Trail/snow/mud 25 psi?
Any thoughts/comments on this?
Highway driving 30 psi?
Trail/snow/mud 25 psi?
Any thoughts/comments on this?
12-29-2009, 06:24 AM
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Try using the chalk test to determine you air pressure.
Get a piece of sidewalk chalk and a tire pressure gauge.
Draw a chalk line across the entire tread of all 4 tires, wide enough to see good. Drive in a straight line for about 100' or so then look at the chalk.
You are shooting to get the chalk to wear evenly across the entire tread pattern. If the chalk is worn on the center you have to much pressure and if it is worn on the sides you don't have enough air. Do this (removing or adding air pressure) until you find the pressure that wears the chalk line evenly. This will give you a good ride, even tire wear, and the best foot print.
I run around 28 to 30 in my KM2's on the street and air down to about 12 when wheeling.
Get a piece of sidewalk chalk and a tire pressure gauge.
Draw a chalk line across the entire tread of all 4 tires, wide enough to see good. Drive in a straight line for about 100' or so then look at the chalk.
You are shooting to get the chalk to wear evenly across the entire tread pattern. If the chalk is worn on the center you have to much pressure and if it is worn on the sides you don't have enough air. Do this (removing or adding air pressure) until you find the pressure that wears the chalk line evenly. This will give you a good ride, even tire wear, and the best foot print.
I run around 28 to 30 in my KM2's on the street and air down to about 12 when wheeling.
Last edited by Robar; 12-29-2009 at 10:23 AM.
12-29-2009, 06:49 AM
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I have load range E tires....I have finally settled in at 32 PSI..
I would say the 30 psi is really close..Just watch them for wear pattterns and adjust as needed..
You can air those tires down to 10-15 lbs.
I would say the 30 psi is really close..Just watch them for wear pattterns and adjust as needed..
You can air those tires down to 10-15 lbs.
12-29-2009, 06:58 AM
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Really that low? I mentioned those kind of numbers to the guy. I said I heard a lot of people are running quite a bit lower thant 25 on trails etc. He said "Yeah but you'll more than likely break the bead on it if you go much lower than 25 psi."
12-29-2009, 07:37 AM
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How wide of wheels are you running? That would effect you slipping a bead of you aired down too low. Generally I have seen most people go down to about 15 and as low as 7-8 for non-beadlock.
12-29-2009, 09:22 AM
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https://www.jk-forum.com/forums/modified-jk-tech-2/modified-tech-faq-answers-questions-every-newbie-has-18617/
Q: On the road, what PSI should I be running in my tires?
A: For optimal comfort and even tire wear. you should not run the recommended PSI listed on the sidewalls of your tires. Typically this will be way too much. On average for a 33" tire, I would recommend that you run your tires at approximately 28-30 PSI. For a 35" tire, I would recommend running approximately 26-28 PSI. For a 37" tire, I would recommend approximately 24-26 PSI.
Q: On the trail, how much should I air my tires down to?
A: Typically, I recommend that people air the tires down to about 10~15 psi.
A: For optimal comfort and even tire wear. you should not run the recommended PSI listed on the sidewalls of your tires. Typically this will be way too much. On average for a 33" tire, I would recommend that you run your tires at approximately 28-30 PSI. For a 35" tire, I would recommend running approximately 26-28 PSI. For a 37" tire, I would recommend approximately 24-26 PSI.
Q: On the trail, how much should I air my tires down to?
A: Typically, I recommend that people air the tires down to about 10~15 psi.
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12-29-2009, 02:11 PM
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