Chalk Test
Tuned
Joined: May 2017
Posts: 467
Likes: 48
From: Mount Arlington, NJ
Problem is Ford using class 5 rolling gear on what is still a class 3 truck. Those 225/70R19.5s are just fine on an F550 (or Ram 5500), but they're major overkill on a class 3 (14K GVWR). Rear tires on my Ram 3500 (LT235/80R17E) are never higher than 50 psi, and I usually run 45. Kind of a waste for an 80 psi-rated tire, but otherwise it would literally bounce all over the road.
Tuned
Joined: Jun 2017
Posts: 361
Likes: 20
From: Clayton, Georgia
Not sure I understand Toyo's pressure/weight charts. They seem designed to establish new tire pressures when changing tire size, using the OEM pressures times a factor....
My tires (LT275/70 R18E) are on page 25 of the .pdf. Am I to assume that if the truck is unloaded and I look for the front and rear axle weights in the table I can run the pressures at the top of those columns until I load the truck? For example, the lowest pressure shown is 35psi for 2070 lbs. So, picking an arbitrary example, if my axle weights are under 2070 lbs. I can run 35 psi? Just trying to understand how to use these tables.
My tires (LT275/70 R18E) are on page 25 of the .pdf. Am I to assume that if the truck is unloaded and I look for the front and rear axle weights in the table I can run the pressures at the top of those columns until I load the truck? For example, the lowest pressure shown is 35psi for 2070 lbs. So, picking an arbitrary example, if my axle weights are under 2070 lbs. I can run 35 psi? Just trying to understand how to use these tables.
Tuned
Joined: May 2017
Posts: 467
Likes: 48
From: Mount Arlington, NJ
Not sure I understand Toyo's pressure/weight charts. They seem designed to establish new tire pressures when changing tire size, using the OEM pressures times a factor....
My tires (LT275/70 R18E) are on page 25 of the .pdf. Am I to assume that if the truck is unloaded and I look for the front and rear axle weights in the table I can run the pressures at the top of those columns until I load the truck? For example, the lowest pressure shown is 35psi for 2070 lbs. So, picking an arbitrary example, if my axle weights are under 2070 lbs. I can run 35 psi? Just trying to understand how to use these tables.
My tires (LT275/70 R18E) are on page 25 of the .pdf. Am I to assume that if the truck is unloaded and I look for the front and rear axle weights in the table I can run the pressures at the top of those columns until I load the truck? For example, the lowest pressure shown is 35psi for 2070 lbs. So, picking an arbitrary example, if my axle weights are under 2070 lbs. I can run 35 psi? Just trying to understand how to use these tables.
Laughing Gas
Joined: Dec 2005
Posts: 906
Likes: 107
From: Seattle area
The weights in the tables are per tire, not per axle. To safely run 35 psi, your axle weight would have to be 4140. If you had a dually, you would use the "dual" weight number and multiply by 4 for the rear axle, but the single weight number multiplied by 2 for the front axle.
Its Comin Right for us!
Joined: Feb 2005
Posts: 12,203
Likes: 2,661
From: GA
you guys with the diesels running below 60 in the front, do you get much feathering? ive had to settle in around 65-68 in my fronts to keep the outside lugs in check. rear 45-50 is good for me most of the time and rotation every 7-10k(every oil change) keeps them all in check. my truck is right at 9000 with tools though
Logistics Pro
Joined: Dec 2004
Posts: 3,541
Likes: 5
From: Weatherford Texas.
you guys with the diesels running below 60 in the front, do you get much feathering? ive had to settle in around 65-68 in my fronts to keep the outside lugs in check. rear 45-50 is good for me most of the time and rotation every 7-10k(every oil change) keeps them all in check. my truck is right at 9000 with tools though
Thread Starter
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Cross-Country
Joined: Oct 2017
Posts: 80
Likes: 7
From: Michigan
Had my 2017 F250 SuperCab LB 4 x 4 weighed last night as follows.
My tires are LT275/70R18E Goodyear A\T Wrangler Adventure
Weights are with me in truck (170 lbs)
Front Axle 4780 lbs
Rear Axle 2800 lbs
Gross weight 7580
So according to Toyo Load Inflation Tables provided by KCJackson1, I can run as low as approx
44-45 lbs in Front @ 2390 lbs per tire
35 lbs in Rear@ 1400 lbs per tire
Is this correct?
My tires are LT275/70R18E Goodyear A\T Wrangler Adventure
Weights are with me in truck (170 lbs)
Front Axle 4780 lbs
Rear Axle 2800 lbs
Gross weight 7580
So according to Toyo Load Inflation Tables provided by KCJackson1, I can run as low as approx
44-45 lbs in Front @ 2390 lbs per tire
35 lbs in Rear@ 1400 lbs per tire
Is this correct?
Tuned
Joined: Jun 2017
Posts: 361
Likes: 20
From: Clayton, Georgia
Had my 2017 F250 SuperCab LB 4 x 4 weighed last night as follows.
Weights are with me in truck (170 lbs)
Front Axle 4780 lbs
Rear Axle 2800 lbs
Gross weight 7580
So according to Toyo Load Inflation Tables provided by KCJackson1, I can run as low as approx
44-45 lbs in Front @ 2390 lbs per tire
35 lbs in Rear@ 1400 lbs per tire
Is this correct?
Weights are with me in truck (170 lbs)
Front Axle 4780 lbs
Rear Axle 2800 lbs
Gross weight 7580
So according to Toyo Load Inflation Tables provided by KCJackson1, I can run as low as approx
44-45 lbs in Front @ 2390 lbs per tire
35 lbs in Rear@ 1400 lbs per tire
Is this correct?
I wondered what the weight of my F250 CCSB 6.2 truck is, looks like going to the CAT scales is the only way to find out. The door sticker only gives GAWR per axle, and Ford specs online only give the base curb weight. No where does it give the front/rear bias, much less the actual axle weights for an empty truck.
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Tuned
Joined: May 2017
Posts: 467
Likes: 48
From: Mount Arlington, NJ
kfederig, In a perfect world, yes. Load/inflation tables are intended to be guidelines, not an exact/absolute. Like any component, you do want some margin for error and potential light loads (other people, etc.) so that you're not constantly inflating and deflating your tires to get to the exact psi/load number. Pressures too low will cause wear and handling issues just like overinflation. But if you're generally running "solo and empty", you definitely do not need max inflation as indicated on the door jamb label.
Thread Starter
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Cross-Country
Joined: Oct 2017
Posts: 80
Likes: 7
From: Michigan
You didn't say what tire size you have, but if you got the above off the chart I suppose it's correct. Wonder what the affect on fuel mileage would be, though, running those pressures.
I wondered what the weight of my F250 CCSB 6.2 truck is, looks like going to the CAT scales is the only way to find out. The door sticker only gives GAWR per axle, and Ford specs online only give the base curb weight. No where does it give the front/rear bias, much less the actual axle weights for an empty truck.
I wondered what the weight of my F250 CCSB 6.2 truck is, looks like going to the CAT scales is the only way to find out. The door sticker only gives GAWR per axle, and Ford specs online only give the base curb weight. No where does it give the front/rear bias, much less the actual axle weights for an empty truck.
My tires are LT275/70R18E Goodyear A\T Wrangler Adventure
Thread Starter
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Cross-Country
Joined: Oct 2017
Posts: 80
Likes: 7
From: Michigan
I have noticed approx 1.5 MPG decrease since reducing my tire pressure from
Front 60 / Rear 65 to
Front 56 / Rear 50.
But the ride has been much improved.
I may bump these up slightly to approx
Front 58 / Rear 52 or so
As a compromise for mileage etc.
Front 60 / Rear 65 to
Front 56 / Rear 50.
But the ride has been much improved.
I may bump these up slightly to approx
Front 58 / Rear 52 or so
As a compromise for mileage etc.
Thread Starter
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Cross-Country
Joined: Oct 2017
Posts: 80
Likes: 7
From: Michigan
Interesting thanks for sharing!
Freshman User
Joined: Oct 2017
Posts: 43
Likes: 0
From: Green Bay Wisconsin
Correct Tire inflation pressure
https://www.goodyeartrucktires.com/p...ion.pdf#page=6
Here is the link to the general information for most tires with inflation specs
Tire Inflation Tables
My 2017 F350 Dually says 70psi on the front and 65psi on rear. I have 60 psi on front and 55 psi on rear and the ride and the wear are better. I am still within the limits for loading weights.
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