tire psi
Lead Driver
Joined: Feb 2000
Posts: 5,374
Likes: 46
From: Palm Bay, Florida
MY LATE '99 F350 DUALLY (2wd) says 60psi both front and rear on the door sticker-I understand that the EARLY '99 DUALLYS are different-45psi?? and I'm not sure why....
IF I run 60psi (to say nothing about the max 80psi) in my rears I will be lucky to have an inch of tread contacting the ground in the center of both tires-(I run empty about 90% of the time.
I am having an odd wear problem with my front tires which I keep pretty much at 80psi-I have tried the 60psi that the factory recommends then 70 then 80 with no change-I have to run no more than 45 psi in the rears to have full pavement contact-I am running Cooper Discoverers 23585R16E Highway tread tires which are pretty similiar to the original Generals that came from the factory on my truck.
The PO of my truck put some ULTRA-EXPENSIVE Michelins in the same size on the front and the truck chewed them up-the BIG TRUCK shop here in town has alligned it and says everything is good but it is still weraing my (cheaper) Coopers out weird.
IF I run 60psi (to say nothing about the max 80psi) in my rears I will be lucky to have an inch of tread contacting the ground in the center of both tires-(I run empty about 90% of the time.
I am having an odd wear problem with my front tires which I keep pretty much at 80psi-I have tried the 60psi that the factory recommends then 70 then 80 with no change-I have to run no more than 45 psi in the rears to have full pavement contact-I am running Cooper Discoverers 23585R16E Highway tread tires which are pretty similiar to the original Generals that came from the factory on my truck.
The PO of my truck put some ULTRA-EXPENSIVE Michelins in the same size on the front and the truck chewed them up-the BIG TRUCK shop here in town has alligned it and says everything is good but it is still weraing my (cheaper) Coopers out weird.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
MY LATE '99 F350 DUALLY (2wd) says 60psi both front and rear on the door sticker-I understand that the EARLY '99 DUALLYS are different-45psi?? and I'm not sure why....
IF I run 60psi (to say nothing about the max 80psi) in my rears I will be lucky to have an inch of tread contacting the ground in the center of both tires-(I run empty about 90% of the time.
I am having an odd wear problem with my front tires which I keep pretty much at 80psi-I have tried the 60psi that the factory recommends then 70 then 80 with no change-I have to run no more than 45 psi in the rears to have full pavement contact-I am running Cooper Discoverers 23585R16E Highway tread tires which are pretty similiar to the original Generals that came from the factory on my truck.
The PO of my truck put some ULTRA-EXPENSIVE Michelins in the same size on the front and the truck chewed them up-the BIG TRUCK shop here in town has alligned it and says everything is good but it is still weraing my (cheaper) Coopers out weird.
IF I run 60psi (to say nothing about the max 80psi) in my rears I will be lucky to have an inch of tread contacting the ground in the center of both tires-(I run empty about 90% of the time.
I am having an odd wear problem with my front tires which I keep pretty much at 80psi-I have tried the 60psi that the factory recommends then 70 then 80 with no change-I have to run no more than 45 psi in the rears to have full pavement contact-I am running Cooper Discoverers 23585R16E Highway tread tires which are pretty similiar to the original Generals that came from the factory on my truck.
The PO of my truck put some ULTRA-EXPENSIVE Michelins in the same size on the front and the truck chewed them up-the BIG TRUCK shop here in town has alligned it and says everything is good but it is still weraing my (cheaper) Coopers out weird.
Anyway, I get cupping on the outside of the wheels and I have paper here that says I'm in alignment. I tried shocks as a last measure and rotated the tires. I now have 4 cupped tires.
I've heard countless tales of members with tread wear. Could they all be cupping edges on the outside like mine? Is it a different type of wear for others? Could it be the nature of turning corners that scrapes the tire edges?
Supercab - your tires are the recommended size. Do you like how they look on your truck? How is the steering stability?
Senior User
Joined: Mar 2011
Posts: 100
Likes: 0
Well, I've eased it on down again and am now at 56 front and 46 rear (at 60*F) ... and I still don't think the rears are running "flat" - but what a smoother ride! I'm gonna keep my eyes on those fronts for edge wear and watch my fuel mileage...
To Supercab and Tugly ... I thought cupping was a sign of bad shocks and maybe too much pressure - but as Tugly has replaced his, the mystery still persists ... hmmm, are the fronts rotated?
To Supercab and Tugly ... I thought cupping was a sign of bad shocks and maybe too much pressure - but as Tugly has replaced his, the mystery still persists ... hmmm, are the fronts rotated?
Hotshot
Joined: Nov 2006
Posts: 11,287
Likes: 263
From: North of Greenville
My experience with cupping, and this is on the original Michelin LTX's, Bridgestone Revos, and my currently running Michelin AT2's is as follows... if you wait too long to rotate, you'll get cupping on the outer edges. I've seen it on every make I've run, and I admit to having a bad habit pf waiting too long to rotate.
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
In regards to rotating, i was told, (many many years ago, lol) to rotate back to front, and keep the tires on the same side. Reason being, is the wear pattern to the metal webbing. If tire was rotated to opposite side, it would help in the metal protruding thru tires? That statement hold water?
Senior User
Joined: Mar 2011
Posts: 100
Likes: 0
Yep, I grew up as you did timmyboy76, when radials came on the scene they were to be rotated only on the same side....but today, that no longer applies unless the tires are "directional" and can only be run in one direction - yep, I was behind the times too! ... which is why I asked if the fronts were rotated, I didn't know if they were directional as I thought these were on a dually ???
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Well, I've eased it on down again and am now at 56 front and 46 rear (at 60*F) ... and I still don't think the rears are running "flat" - but what a smoother ride! I'm gonna keep my eyes on those fronts for edge wear and watch my fuel mileage...
To Supercab and Tugly ... I thought cupping was a sign of bad shocks and maybe too much pressure - but as Tugly has replaced his, the mystery still persists ... hmmm, are the fronts rotated?
To Supercab and Tugly ... I thought cupping was a sign of bad shocks and maybe too much pressure - but as Tugly has replaced his, the mystery still persists ... hmmm, are the fronts rotated?
I think this one topic warrants a dedicated thread. I'll see if I can open one without starting a conflict over cupping.
Thread
Thread Starter
Forum
Replies
Last Post
SoCal69
1967 - 1972 F-100 & Larger F-Series Trucks
8
May 12, 2019 12:03 PM
45 ACP
1999 - 2016 Super Duty
6
May 3, 2010 10:23 AM
