43psi recommended in 325/60-18 Terra Grapplers - Nissan Titan Forum
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post #1 of 18 (permalink) Old 08-21-2009, 02:45 PM Thread Starter
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43psi recommended in 325/60-18 Terra Grapplers

.... 43 psi appears to be the official recommendation from Nitto.

I know it's been asked several times on the forum and now we have an official answer from the manufacturer. A discussion about LT tire psi and load handling in another thread prompted me to give Nitto a call to see what PSI I'm officially supposed to be running to retain the original tire load capacity.

Terra Grappler LT325/60-18 are rated at 50psi MAX allowed.

After some calculations, the lady at Nitto told me that I should be running them at 43psi under all circumstances.

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post #2 of 18 (permalink) Old 08-21-2009, 02:48 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

And that sounds right to me.

I run the stock Rugged Trails at 40 and bump to 44 for towing the car hauler.


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post #3 of 18 (permalink) Old 08-21-2009, 03:34 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Thats what I run my toyos at.


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post #4 of 18 (permalink) Old 08-21-2009, 04:00 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Would the 325/65/18's be the same?


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post #5 of 18 (permalink) Old 08-21-2009, 04:16 PM Thread Starter
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Quote:
Originally Posted by themaildude View Post
Would the 325/65/18's be the same?
Yes. I went ahead and asked because my next set will be 35's and there's plenty of people on this site with them. She asked if I know if it's the same max psi since I had the specs in front of me and I told her "yes" and she said "yes, it's the same then".

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post #6 of 18 (permalink) Old 08-21-2009, 04:20 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Thanks Pops. Gotta add some air. I've been running 36lbs on this set. I ran 40 on my 325/60/18's and got 52K out of them and could of got some more. They wore really well @ 40 psi.


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post #7 of 18 (permalink) Old 08-21-2009, 06:08 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Good to know there Pop, much appreciated.
I'm already at 40psi, might have to bump them up to 43psi this weekend.



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post #8 of 18 (permalink) Old 08-21-2009, 06:35 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

I run mine between 43 and 45, so I guessed right

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post #9 of 18 (permalink) Old 08-21-2009, 08:49 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

got a little double-posting going on...

I'll re-post here...

How can you run the same pressure fully loaded AND un-loaded?

The Titan can't weigh enough for the tiires max rated 50 psi, but just as you don't need a full 50 psi, you would reduce tire pressure when you reduce the weight it's carrying...I'm not saying it's 100% linear, but as you remove weight, there can be a safe reduction in air pressure...

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post #10 of 18 (permalink) Old 08-21-2009, 09:35 PM Thread Starter
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Lou, if it's not raining, I'm gonna pick up the TT in the morning and take it to the scales to prove to myself then post on ClubArmada how Weight Distribution affects axle weights. I'll write a list of the process down tonight and I'll add checking the PSI while hitched to my to do list.


When I was early at truck driving, I was asking an experienced diesel mechanic about sliding the fifth wheel and a trailer's tandem axle for weight distribution. The discussion strayed to discussing retreads then PSI. To put it simply, he said the only way to increase PSI is to add air and the only way to reduce it is to remove air. He said it's the volume of air inside the tire that determines the PSI. I asked about a tire squatting. He said, yea it's squatting flatter on the bottom but it's also bowing out wider somewhere else so the total volume is still the same. Bottom line, unless there is air being added into the tire or the total allowable volume space that it can occupy is being reduced, the total PSI remains constant regardless of the weight set on top. The only thing that changes with a changed shape are the areas where the stress on the container (tire) are relaxed while others are increased. If 43-psi is the pressure required to hold the tire in its rigid shape then the PSI will not change.

So, what about a blowout from overloading?? If you have a P-rated tire for example that's aired to 35-psi then overloaded so the sidewalls are about to burst and put a pressure guage to the tire, the total PSI will still be at 35-psi. The difference is the pressure points where the flattened tread area has been relaxed which requires another area to take over the load (like the sidewalls) and the weakest area is the most flexible so as the pressure pushing against the tread is reduced, the pressure on the sidewall is increased, BUT the total PSI is still at 35-psi. If a tire is rated for 2,000-lbs and 43-psi is documented as enough pressure required to keep the tires shape enough to prevent pressure redistribution then that scenerio will not happen until the max load is exceeded.

I hope my babbling makes some sense.

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Last edited by Pops; 08-21-2009 at 09:38 PM.
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post #11 of 18 (permalink) Old 08-21-2009, 10:05 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

All the lady from Nitto did was look at the maximum load the stock P265/70R18 tires can handle, (at their maximum 35 psi), and match the load capacity via psi on the LT325/60R18 D. However, she forgot to de-rated the OEM tires' 2601 lbs. capacity to 2365 lbs. because they are being used on a truck instead of a car. [Divide by 1.1].
So to match the OEM tires' maximum capacity, the LT325/60R18 D needs only 36 lbs.

But as Loufish said, it is dependent on load, not matching the OEM's tire's maximum capacity. However, you also don't want to run the LT's below 35 psi unless you're off roading. For this tire, 36 or 35 isn't a big difference, but for many sizes of LT's the range will be more like 50-35 psi, that can be selected for loading on a Titan, while the same tire could be used up to 80 psi for some models, on bigger trucks.

Quote:
Originally Posted by walleeme View Post
And that sounds right to me.

I run the stock Rugged Trails at 40 and bump to 44 for towing the car hauler.
The P285/70R17 Rugged Trail is rated for a maximum 35 psi. You must not exceed 35 psi, and if one were to blow while airing up ... not good for the face.

Most things are engineered for a 10% buffer, so you might be safe at 39 or 40 psi, but at 44 psi you're exceeding spec by 25%.


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Last edited by NorCal 4x4; 08-21-2009 at 10:18 PM.
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post #12 of 18 (permalink) Old 08-21-2009, 10:54 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Quote:
When I was early at truck driving, I was asking an experienced diesel mechanic about sliding the fifth wheel and a trailer's tandem axle for weight distribution. The discussion strayed to discussing retreads then PSI. To put it simply, he said the only way to increase PSI is to add air and the only way to reduce it is to remove air. He said it's the volume of air inside the tire that determines the PSI. I asked about a tire squatting. He said, yea it's squatting flatter on the bottom but it's also bowing out wider somewhere else so the total volume is still the same. Bottom line, unless there is air being added into the tire or the total allowable volume space that it can occupy is being reduced, the total PSI remains constant regardless of the weight set on top. The only thing that changes with a changed shape are the areas where the stress on the container (tire) are relaxed while others are increased. If 43-psi is the pressure required to hold the tire in its rigid shape then the PSI will not change.

So, what about a blowout from overloading?? If you have a P-rated tire for example that's aired to 35-psi then overloaded so the sidewalls are about to burst and put a pressure guage to the tire, the total PSI will still be at 35-psi. The difference is the pressure points where the flattened tread area has been relaxed which requires another area to take over the load (like the sidewalls) and the weakest area is the most flexible so as the pressure pushing against the tread is reduced, the pressure on the sidewall is increased, BUT the total PSI is still at 35-psi. If a tire is rated for 2,000-lbs and 43-psi is documented as enough pressure required to keep the tires shape enough to prevent pressure redistribution then that scenerio will not happen until the max load is exceeded.
Think about it, if the tire is rated for max load of 3000 lbs at 50 psi, 50 psi isn't needed when the tire is only loaded to say 1250 lbs. I'm not advicating running the tire down at 25 psi, I'm just saying a tire with that much load rating can be run safely at less pressure with less load.

I've run 33-35 inch LT tires all my life on the rear of empty p/u trucks at 35 psi and never had a wear problem, or tread seperation. Of course when loading up the trucks I'll run more pressure.

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post #13 of 18 (permalink) Old 08-21-2009, 11:06 PM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Holy sh!t I run mine anywhere between 32-36 psi lol...40 would cause mine to bounce like no other on the freeway...wonder what I should run them for being a 325/50R22?


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post #14 of 18 (permalink) Old 08-22-2009, 06:46 AM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

Quote:
Holy sh!t I run mine anywhere between 32-36 psi lol...40 would cause mine to bounce like no other on the freeway...wonder what I should run them for being a 325/50R22?
I just installed a set of Pro Comp Extreme A/T's in 35-12.50/ 17....Dropped pressure from 40 to 35 and made a big difference in ride...

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post #15 of 18 (permalink) Old 08-22-2009, 09:25 AM
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Re: 43psi recommended in 325/60-18 Terra Grapplers

According to Goodyear, the stock tire (265/70-18 114 SL SR-A) @ 35psi carries 2601lbs. The 325/60-18 119 D2 (50 PSI MAX cold) Nitto Terra Grappler @ 35 PSI carries 22405lbs and @ 40 PSI carries 2605lbs. If one were to air this size Terra Grappler up to 45 PSI, the tire will carry 2780lbs. At max pressure (50 PSI cold), the tire will carry 3000lbs.

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Last edited by Discount Tire; 08-24-2009 at 12:21 PM.
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