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Tire pressure help #5093642 05/02/19 10:37 AM
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Env1ous Offline OP
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Hi all, so I have a 2013 F150 and replaced the tires with a set of Cooper Discoverer ATP tires in 275 /70 R18 E Range tire (Since finding bigger tires in anything else is difficult)

I know E range have a different PSI requirement than the typical LT rated tires. I have mine aired up to around 48 PSI. Is that too much for daily driving? Ride does seem a little stiff and it takes bumps hard. I know it will have more feedback than an LT tire. I just want to make sure my tires last a long time!

p.s. Does anyone else have these? Are they a little loud on the road?

Re: Tire pressure help [Re: Env1ous] #5093653 05/02/19 10:45 AM
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gfh77665 Offline
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Originally Posted by Env1ous
Ride does seem a little stiff and it takes bumps hard.


Your answer is right there.

Drop 5 PSI and drive for a week to test.

Re: Tire pressure help [Re: gfh77665] #5093656 05/02/19 10:48 AM
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Env1ous Offline OP
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Thanks for the quick reply! Will do. Rather ask people with experience. I looked on forums and got so many different answer. It was making my head spin!

Re: Tire pressure help [Re: Env1ous] #5093686 05/02/19 11:08 AM
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MParr Offline
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Just a reminder; a load range E tire is standard for 3/4 ton trucks. With a 3/4 ton truck tire, it’s going to be a a harder ride. Fill to the pressure on the door sticker.

Last edited by MParr; 05/02/19 11:08 AM.

2019 VW Tiguan SE Now: Mobil 1 ESP 5W30 & OE VW/Mann
2017 Ford Escape SE 2.0T Now: Motorcraft 5W30 SynBlend & NAPA Gold 1348
Re: Tire pressure help [Re: Env1ous] #5093697 05/02/19 11:18 AM
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das_peikko Offline
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What does it say on the tire for the maximum? I always go 4 PSI below the maximum on the tire.

Re: Tire pressure help [Re: das_peikko] #5093698 05/02/19 11:20 AM
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Env1ous Offline OP
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Originally Posted by das_peikko
What does it say on the tire for the maximum? I always go 4 PSI below the maximum on the tire.


80PSI max. LOL Not going to 76. Don't need it that high. I just saw the max on it.

Re: Tire pressure help [Re: gfh77665] #5093700 05/02/19 11:21 AM
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JLTD Offline
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Originally Posted by gfh77665
Originally Posted by Env1ous
Ride does seem a little stiff and it takes bumps hard.

Your answer is right there.

Drop 5 PSI and drive for a week to test.

Agree....and also watch for any developing wear patterns....center wear = overinflated, edge wear (rear) underinflated. Expect a little edge wear on the fronts...but that'll be taken care of with rotation.


I use the overseas manual to choose my viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: Tire pressure help [Re: Env1ous] #5093712 05/02/19 11:30 AM
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OVERKILL Online Content
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IIRC, the "proper" method for determining pressure is to use the load tables.

There's info about this on CapriRacer's site:
http://www.barrystiretech.com/

If you go to the load tables and see that your factory P-rated tires which were, for the sake of this example, 275/60R18s and spec'd 35psi, which results in a load rating of 2,403lbs, we then need to de-rate them by 10% to account for a P-rated tire on a truck/SUV, which results in a 2,185lb rating.

This is actually documented here:
https://www.toyotires.ca/sites/default/files/application_of_load_inflation_tables_20170203.pdf

So, you look at the load table for the LT tires, which is, for your size, down on page 23, and we see that for a 275/70R18 we need 40PSI to achieve roughly the same weight rating.

So, find your factory tires in the P-metric list, find their weight rating, derate them by 10%, and that will give you the the minimum value you need to shoot for when choosing a pressure for the LT tires.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Ravenol SSL 0w-40, FRAM Ultra
Re: Tire pressure help [Re: das_peikko] #5093758 05/02/19 12:15 PM
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RamFan Offline
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Originally Posted by das_peikko
I always go 4 PSI below the maximum on the tire.


Why?


18 Giulia Ti Sport Q4
  • 2.0T I4 - 18k - PP Euro LX 0w30 - Mobil 1 - 10k/1yr

16.5 CX-5 Touring AWD
  • 2.5L I4 - 64k - Castrol Edge EP 0w20 - Denso - 7.5k/1yr
Re: Tire pressure help [Re: RamFan] #5093815 05/02/19 01:19 PM
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Quattro Pete Offline
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Originally Posted by RamFan
Originally Posted by das_peikko
I always go 4 PSI below the maximum on the tire.


Why?

Because that's what he was told by a "reliable source" smirk2

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5057191/tire-pressure

Just ignore him. He's trolling as usual.


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Tire pressure help [Re: OVERKILL] #5093819 05/02/19 01:28 PM
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Env1ous Offline OP
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Originally Posted by OVERKILL
IIRC, the "proper" method for determining pressure is to use the load tables.

There's info about this on CapriRacer's site:
http://www.barrystiretech.com/

If you go to the load tables and see that your factory P-rated tires which were, for the sake of this example, 275/60R18s and spec'd 35psi, which results in a load rating of 2,403lbs, we then need to de-rate them by 10% to account for a P-rated tire on a truck/SUV, which results in a 2,185lb rating.

This is actually documented here:
https://www.toyotires.ca/sites/default/files/application_of_load_inflation_tables_20170203.pdf

So, you look at the load table for the LT tires, which is, for your size, down on page 23, and we see that for a 275/70R18 we need 40PSI to achieve roughly the same weight rating.

So, find your factory tires in the P-metric list, find their weight rating, derate them by 10%, and that will give you the the minimum value you need to shoot for when choosing a pressure for the LT tires.


After looking. It says around 45psi. I think I am currently around 50. So I will decrease and see how 45psi feels and look at tire wear. I saw something called the calk test, to make sure the inflation looks good?

Re: Tire pressure help [Re: das_peikko] #5093824 05/02/19 01:32 PM
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Kibitoshin Offline
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Originally Posted by das_peikko
What does it say on the tire for the maximum? I always go 4 PSI below the maximum on the tire.


Didn't you read the post?! They are Load Range E tires which means they have a 80PSI maximum pressure and you are recommending 76PSI?!

When I went to from P to an LT my tire shop (which referenced Toyo's inflation tables) recommended 45PSI front and rear.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: Tire pressure help [Re: Env1ous] #5093829 05/02/19 01:41 PM
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JohnnyJohnson Offline
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If you want a soft ride don't buy E rated tires.


2004 Corolla 136143
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 76552
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73705 4-22-18
Re: Tire pressure help [Re: JohnnyJohnson] #5093839 05/02/19 01:53 PM
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Env1ous Offline OP
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Originally Posted by JohnnyJohnson
If you want a soft ride don't buy E rated tires.


Don't want a soft ride. But when I hit bumps my rear kicks out on me. So I was more so wondering if I had them over inflated and I do. So it does hit bumps a little stiffer than it should

Re: Tire pressure help [Re: Env1ous] #5093854 05/02/19 02:05 PM
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sloinker Online Shocked
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Inflate them to recommended factory pressure if they are the correct tire size and load range. It seems the last set of E range tires on Ford pickup I owned was 51 psi front and 60 psi rear. That was a 1990 F-250 4x4 diesel. Your results may vary...


'16 Tiguan TSI Ravenol VST 5W40
'15 VW Golf TDI Ravenol VMP 5W30
'15 VW Golf Sportwagen TDI VMP 5W30
'14 Dodge Grand Caravan 3.6 Red Line Blue Label 5W20
'64 Plymouth Fury440 Red Line Blue Label 10W40
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