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What tire PSI should I run?

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Old 04-02-2012, 05:26 PM   #21
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You'll need a piece of chalk, a tire gauge, a pen and a note pad. Make a chalk mark across the tread as pictured, on one front and one rear tire, and then drive a quarter mile or so in a straight line. Stop and study the chalk marks and note the pressure readings on the gauge.
This tire shows over-inflation, having relatively intact marks at the shoulders while the center of the line is more worn. Ideally, the chalk would have faded evenly across the tread surface. Let out some air and try again.
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Old 04-02-2012, 05:49 PM   #22
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^ this will only work if the alignment is spot on.
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Old 04-02-2012, 05:50 PM   #23
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by DWreck View Post
^ this will only work if the alignment is spot on.
yeah. Hopfully everyone is driving a vehicle with the correct alignment.
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Old 04-02-2012, 07:46 PM   #24
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That's not a test... Here's a test! (LOL)

Okay,

Step 1, check that your tires are all at the pressure you assunme to be correct.

For my Dynapros, they all are at 37 psi. I have (by feel) determined 36-40 psi to be a good range for these 44 psi max. tires on my lightly loaded to unloaded 4 door Tacoma.

Step 2, with big sidewalk chalk, make a one inch bar across the tread.

Step 3, drive for approx. 100 feet and then see how the chalk wears off.

If it wears mostly in the center, too much air. If more wears on the outsides, then too little air. If wears is even across the tire, you are gold!

Right Rear Before and After:





Right Front Before and After:





Left Front Before and After:





Left Rear Before and After:






There you go.... looks pretty even, yes? Maybe just a hair high? What do you think?

FYI, these tires have 16,000 miles on them. Hankook Dynapro ATm 265/75-16.
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Old 04-02-2012, 09:07 PM   #25
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Quote:
Originally Posted by David K View Post
Okay,

Step 1, check that your tires are all at the pressure you assunme to be correct.

For my Dynapros, they all are at 37 psi. I have (by feel) determined 36-40 psi to be a good range for these 44 psi max. tires on my lightly loaded to unloaded 4 door Tacoma.

Step 2, with big sidewalk chalk, make a one inch bar across the tread.

Step 3, drive for approx. 100 feet and then see how the chalk wears off.

If it wears mostly in the center, too much air. If more wears on the outsides, then too little air. If wears is even across the tire, you are gold!

Right Rear Before and After:





Right Front Before and After:





Left Front Before and After:





Left Rear Before and After:






There you go.... looks pretty even, yes? Maybe just a hair high? What do you think?

FYI, these tires have 16,000 miles on them. Hankook Dynapro ATm 265/75-16.
Yep, a tad high, but close. The biggest mistake people make with E tires is believing they need more pressure than any other tire. They don't. They just have a greater capacity. They run ridiculous pressures and then complain about the harsh ride. My truck is around 5,000lbs with weight front and back within 100lbs. I run 36 for daily driving, 40 on the highway. If I'm carrying a load I bump the back to 45. I won't run anything but E tires on my truck.
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Old 04-03-2012, 12:10 AM   #26
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Right... I started these at the Rugged Trail's recommended 29/32... and they felt 'squishy' driving, turning, etc. Right away I raised them and tried the 36-40 psi range (they have a max. rating of 44 psi)... I think I will drop to 35 psi and run it for a bit, or re-do the chalk test at 35.
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Old 04-03-2012, 12:49 AM   #27
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29-32. Overinflated-reduced traction.
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Old 04-03-2012, 12:53 AM   #28
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Quote:
Originally Posted by sonocotaco View Post
29-32. Overinflated-reduced traction.
29/32 is what the Rugged Fails were recommended (they were a 35 psi max. tire)... I ran mine at that.

The Hankooks are a 44 psi max tire, and when I tried them at 32, they were squishy feeling, not normal. At 36-40 they feel great, as did the Rugged Fails did at 32.
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Old 04-03-2012, 07:00 AM   #29
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Talking

Just to add on an excellent pictorial on the subject. I would recommend doing this test on warm tires since that is how you would want the tire to be at it's optimum inflation. Of course we check our pressure when cold so if you are testing a tire at 35 psi cold and you then drive 5 miles or so then do the chalk test. If it shows you need to adjust then do so when the tires are cold again. Drive it till warm and test again. Sucks and takes longer but once you know your true base pressure you should be good to go. I've always thought a few pounds either way is not noticeable but with the Taco I can tell a very noticeable difference with as little as 3 psi. Of course all of this is only useful for us truly anal owners.
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Old 04-03-2012, 09:07 AM   #30
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Quote:
Originally Posted by Buff View Post
Just to add on an excellent pictorial on the subject. I would recommend doing this test on warm tires since that is how you would want the tire to be at it's optimum inflation. Of course we check our pressure when cold so if you are testing a tire at 35 psi cold and you then drive 5 miles or so then do the chalk test. If it shows you need to adjust then do so when the tires are cold again. Drive it till warm and test again. Sucks and takes longer but once you know your true base pressure you should be good to go. I've always thought a few pounds either way is not noticeable but with the Taco I can tell a very noticeable difference with as little as 3 psi. Of course all of this is only useful for us truly anal owners.
For sure!

I did the chalk test yesterday afternoon, it was about 75º here in Oceanside, about 4 miles in from the beach and I drove about 2 miles before measuring the tire pressure. It was 37 psi for the test, and (I just checked) this morning, undriven, the pressure is 34 psi.
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Old 04-03-2012, 09:39 AM   #31
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I run 42/39 front/rear on the highway with mine. I keep it there until I go wheeling. Then I run 12/12. And when I do retrievals and need more traction, I run 22/20.
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Old 04-03-2012, 09:44 AM   #32
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35 PSI - Front & Back works best for my needs on OEM sized 265-70-16 tires.

As soon as theres OEM BFGs wear out ... I will be back with Michelin LTX-AT2s or MS2s in a heartbeat.
.
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Old 08-15-2012, 10:41 AM   #33
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Quote:
Originally Posted by RainDodger View Post
The Tire Rack has a guy just for that - call them. He will tell you what to run based on your specific truck, your specific tires/sizes, and the loads you carry. Takes about 1 minute and that's what he's there for.

I have non-stock tires on my '09 and he told me precisely what pressures to start with.

Roger
I just spoke to Lance at Tire Rack and he told me they recommend that their customers go by the label that is on the door panel regardless if you have different tires than what originally came on the truck. Not much help.
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Old 08-15-2012, 11:54 AM   #34
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Quote:
Originally Posted by w/chunter View Post
I just spoke to Lance at Tire Rack and he told me they recommend that their customers go by the label that is on the door panel regardless if you have different tires than what originally came on the truck. Not much help.
He's just covering the liabilities.
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Old 08-15-2012, 12:30 PM   #35
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My $0.02:

I run anywhere between 32 and 35 psi on all four corners depending on the situation. For long FWY drives, I run them at 35 psi (cold). If I am going anywhere off-highway, I run them at 32 psi. Have not had a problem to date and the tires are wearing even across the thread.
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Old 03-20-2013, 10:17 AM   #36
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[Original Tires Max Load Rating] * [Sticker's Recommended P.S.I.] / [Original Tires Max P.S.I.] * [New Tires Max P.S.I.] / [New Tires Max Load Rating].
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Old 03-20-2013, 12:30 PM   #37
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Quote:
Originally Posted by colinb17 View Post
once you go to a size and/or load range that is different than stock, what the door jam and owners manual say may not be correct any more.

chalk test is always a safe way to figure out what PSI will wear your tires best (assuming your alignment is good)
I have Goodyear Duramax and they wearing well at 32. I only run max on trailers.
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Old 03-21-2013, 06:43 PM   #38
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FWIW ... I have had LTX-AT2s and now have LTX-MS2s and the perfect year around PSI for my limited loads, driving style and weather is ... 33 PSI ... Front & Rear ...
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Old 04-03-2013, 08:19 AM   #39
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Quote:
Originally Posted by David K View Post
Okay,

Step 1, check that your tires are all at the pressure you assunme to be correct.

For my Dynapros, they all are at 37 psi. I have (by feel) determined 36-40 psi to be a good range for these 44 psi max. tires on my lightly loaded to unloaded 4 door Tacoma.

Step 2, with big sidewalk chalk, make a one inch bar across the tread.

Step 3, drive for approx. 100 feet and then see how the chalk wears off.

If it wears mostly in the center, too much air. If more wears on the outsides, then too little air. If wears is even across the tire, you are gold!

Right Rear Before and After:





Right Front Before and After:





Left Front Before and After:





Left Rear Before and After:






There you go.... looks pretty even, yes? Maybe just a hair high? What do you think?

FYI, these tires have 16,000 miles on them. Hankook Dynapro ATm 265/75-16.
I was curious about this as well. Thanks!
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Old 04-03-2013, 10:08 AM   #40
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I just wet down my driveway in one spot and drive thru it slowing and look a wet tire marks. easy to read whether you are getting full tread or not and raise or lower tire pressure. if I am not hauling, I run more air pressure in the front than in the rear.
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