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Tire pressure help #5093642
05/02/19 10:37 AM
05/02/19 10:37 AM
Joined: Feb 2019
Posts: 225
Denver, CO
Env1ous Online content OP
Env1ous  Online Content OP

Joined: Feb 2019
Posts: 225
Denver, CO
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
05/02/19 10:45 AM
Joined: Sep 2008
Posts: 4,177
Southeast Texas
gfh77665 Offline
gfh77665  Offline

Joined: Sep 2008
Posts: 4,177
Southeast Texas
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
05/02/19 10:48 AM
Joined: Feb 2019
Posts: 225
Denver, CO
Env1ous Online content OP
Env1ous  Online Content OP

Joined: Feb 2019
Posts: 225
Denver, CO
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
05/02/19 11:08 AM
Joined: Oct 2017
Posts: 1,026
Georgia
MParr Offline
MParr  Offline

Joined: Oct 2017
Posts: 1,026
Georgia
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: Factory fill & OEM filter
2017 Ford Escape SE 2.0T Now: NAPA Synthetic 5W30 & NAPA Gold 1348
Re: Tire pressure help [Re: Env1ous] #5093697
05/02/19 11:18 AM
05/02/19 11:18 AM
Joined: Jan 2018
Posts: 1,196
San Antonio, TX
das_peikko Offline
das_peikko  Offline

Joined: Jan 2018
Posts: 1,196
San Antonio, TX
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
05/02/19 11:20 AM
Joined: Feb 2019
Posts: 225
Denver, CO
Env1ous Online content OP
Env1ous  Online Content OP

Joined: Feb 2019
Posts: 225
Denver, CO
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
05/02/19 11:21 AM
Joined: Dec 2017
Posts: 2,270
CO
JLTD Offline
JLTD  Offline

Joined: Dec 2017
Posts: 2,270
CO
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 oil viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 149k, SS5w30/Amsoil

His: 2015 4Runner 55k, OE5w30/Wix

Re: Tire pressure help [Re: Env1ous] #5093712
05/02/19 11:30 AM
05/02/19 11:30 AM
Joined: Apr 2008
Posts: 40,002
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline

Joined: Apr 2008
Posts: 40,002
Ontario, Canada
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
05/02/19 12:15 PM
Joined: May 2010
Posts: 2,334
Illinois, U.S.A
RamFan Online sleepy
RamFan  Online Sleepy

Joined: May 2010
Posts: 2,334
Illinois, U.S.A
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 - 12k - PP Euro LX 0w30 - Mobil 1 - 10k/1yr

16.5 CX-5 Touring AWD
  • 2.5L I4 - 60k - Citgo Supergard Syn 5w30 - Denso - 7.5k/1yr
Re: Tire pressure help [Re: RamFan] #5093815
05/02/19 01:19 PM
05/02/19 01:19 PM
Joined: Oct 2002
Posts: 37,517
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline

Joined: Oct 2002
Posts: 37,517
Great Lakes
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.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Tire pressure help [Re: OVERKILL] #5093819
05/02/19 01:28 PM
05/02/19 01:28 PM
Joined: Feb 2019
Posts: 225
Denver, CO
Env1ous Online content OP
Env1ous  Online Content OP

Joined: Feb 2019
Posts: 225
Denver, CO
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
05/02/19 01:32 PM
Joined: Apr 2016
Posts: 843
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline

Joined: Apr 2016
Posts: 843
Specific Ocean
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
05/02/19 01:41 PM
Joined: Oct 2009
Posts: 4,843
Wet side WA
JohnnyJohnson Online content
JohnnyJohnson  Online Content

Joined: Oct 2009
Posts: 4,843
Wet side WA
If you want a soft ride don't buy E rated tires.


2004 Corolla 132848
Out: EDGE EP 5W-30 Bosch 3311 7156 Miles
In: Havoline Pro DS 10w-30 Purolator PureOne 3-14-19 129693
2006 Duramax 75007
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
05/02/19 01:53 PM
Joined: Feb 2019
Posts: 225
Denver, CO
Env1ous Online content OP
Env1ous  Online Content OP

Joined: Feb 2019
Posts: 225
Denver, CO
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
05/02/19 02:05 PM
Joined: Aug 2017
Posts: 692
WY
sloinker Offline
sloinker  Offline

Joined: Aug 2017
Posts: 692
WY
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...

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