Tire pressure question...
Cross-Country
Joined: Dec 2019
Posts: 54
Likes: 10
From: Bonita Springs FL
I weighed my truck on a CAT scale and adjusted tire pressure as per tire manufacturers recommendation
I run Continentals MPT81's so I had to convert Bar's to Psi and Tons to Lbs
Front 5540 - 70Psi
Rear 4500 - 60Psi
I run Continentals MPT81's so I had to convert Bar's to Psi and Tons to Lbs
Front 5540 - 70Psi
Rear 4500 - 60Psi
More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
No. You can thank FORD for the TPMS bullcrap...
"The Firestone recall in the late 1990s (which was linked to more than 100 deaths from rollovers following tire tread-separation), pushed the United States Congress to legislate the TREAD Act. The Act mandated the use of a suitable TPMS technology"
"Firestone argued that Ford's recommended 26 psi inflation pressure was too low and should have been 30 psi"
Ford wanted lower tire pressures on the Explorer to give it a better ride.
"The Firestone recall in the late 1990s (which was linked to more than 100 deaths from rollovers following tire tread-separation), pushed the United States Congress to legislate the TREAD Act. The Act mandated the use of a suitable TPMS technology"
"Firestone argued that Ford's recommended 26 psi inflation pressure was too low and should have been 30 psi"
Ford wanted lower tire pressures on the Explorer to give it a better ride.
Senior User
Joined: Nov 2019
Posts: 171
Likes: 1
It seems to be 50 psi on mine, i normally run 53 all the way around while not towing and it stays off. If it hits 50 I get the light. 2020 250 w/HDTT
Hotshot
Joined: Jun 2003
Posts: 12,340
Likes: 4,363
From: SW VA
You didn't have an issue because you kept your pressures within the tires spec.
Mountain Pass
Joined: Oct 2019
Posts: 231
Likes: 3
After a chalk test with stock michelins, 55 front and 50 rear had the best results (tread wear and comfy ride) unloaded. Im running the same for my nitto ridge grapplers at 55/50 unloaded.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
But it wasn't the public's fault. It was Ford's fault. The public WAS checking their tire pressures and keeping them at Ford's recommended pressure of 26psi. Why was it never a problem until the late '90's Explorer came along? People just didn't wake up one day in unison and say "you know what...I'm gonna stop checking my tire pressure today!"
You didn't have an issue because you kept your pressures within the tires spec.
You didn't have an issue because you kept your pressures within the tires spec.
New User
Joined: Jun 2020
Posts: 17
Likes: 0
Did the chalk test on mine, upgraded to 35x12.5x20r Nitto Trail Grapplers on 2020 F350 w/ 2" leveling kit. Front was 50 PSI, rears were ~30PSI unloaded. Bit lower on the rear than I'm comfortable with, not sure if being that low will cause unnecessary side wall flex/wear? Dealer put them back to stock 60/80 when they re balanced them (Kept having the tire weights fall off after they put the new tires/wheels on). So I may do 55/55 - I did just finish installing a Viair Ultra Duty 200 PSI compressor in the bed tool box, so easier to adjust out and about.
Mountain Pass
Joined: Oct 2019
Posts: 231
Likes: 3
Did the chalk test on mine, upgraded to 35x12.5x20r Nitto Trail Grapplers on 2020 F350 w/ 2" leveling kit. Front was 50 PSI, rears were ~30PSI unloaded. Bit lower on the rear than I'm comfortable with, not sure if being that low will cause unnecessary side wall flex/wear? Dealer put them back to stock 60/80 when they re balanced them (Kept having the tire weights fall off after they put the new tires/wheels on). So I may do 55/55 - I did just finish installing a Viair Ultra Duty 200 PSI compressor in the bed tool box, so easier to adjust out and about.
Laughing Gas
Joined: Jun 2020
Posts: 778
Likes: 14
From: Seattle area, WA USA
Can someone please point me to info on this chalk test? By the name, I'm guessing you chalk the treads and use that to measure contact patch? Are there guidelines on the proper measurements?
Senior User
Joined: Dec 2019
Posts: 377
Likes: 9
