Brand spankin’ new 2020 F-350 diesel, SRW, Crewcab, 6’9” bed. Dealer had tires at the max of course at 80psi. I know this truck isn’t going to ride like my previous F-150...

Looks like my curb weight is ~7,500 lbs. Does anyone have the approximate weight on each axle (SRW, Shortbed, Crew, Diesel)?

And does anyone know an approximate minimum tire psi when not hauling or towing (Michelin LTX A/T2 LT275/65R20)? I’ve seen the load charts but I’m looking to get down to minimum safe and good wear psi for front and back? I’ll inflate to max when pulling my fifth wheel, but for daily driving that’s way too much...

Thanks!

 

I'm in an F-250, but I'm running 50 psi all around unloaded.

13000 miles on these, 1 rotation so far...
Front:

Rear:

 

I always run recommended psi in the front and air down the back to whatever.

Usually 45-50 psi makes a good difference in ride and lets the tires wear evenly.

I’ve gone as low as 28psi on duallies.

 

I am trying out 50/55 with the same tires, be warned you will need to adjust the TPMS in forscan. The changes will also show in the Fordpass app.

 

Very similar truck as you (2020 F350 SRW crew cab short bed Lariat 6.7 powerstroke 4x4 FX4 with 18" wheels). Truck weighs 8160 pounds.

Dealer had the pressure at 60 psi on the front and 80 on the rear like Ford recommends and I left it there since I tow and I didn't want to monkey around airing up the tires all the time. I think the truck rides fine at those pressures. Much better than the 2500 Chevy it replaced.

 

Don't know about Michelin but I rub just enough to keep TPM from going off. When I have TT I air back to 70

 

I'd google your tire model's load & inflation tables. That will tell you what to air to. I round up to the nearest 5 psi to ensure I'm always covered no matter the load I'm at. I'd also take your truck to a scale and weigh the axle. My gasser was 7440# with me in it. I'm betting your diesel is more like 8k. I run 50f/40r on 35x12.5 ridge graps and tire wear looks good so far. I found most of this out when I towed and the trailer felt loose behind me. Rear tires were at 65 psi. I pulled into an empty lot and noticed the dust on the contact patch was only half the width of the tire. Way overinflated. I aired down to the recommended 50 psi for my load and it tows perfect now. Those tables show you what's safe and what's better for your tread life.

 

The rear axle should a little over 3000 lbs with no cargo and occupants. Obviously with some normal stuff in the truck plus occupants it goes up pretty fast.


I think that was the answer to your question.

 

If your truck is empty weigh the axles. If it’s a diesel, it’s close to payload on the front, but only about 1/2 on the rear.

 

I run 50psi all around, same truck, but a '19.

 

60 front 50 rear for me. I need to get back into Forescan to turn the threshold down so the dang light will go off though.

 

My 2019 has approximately 3200 lbs on the rear axle and 4900 on the front. I run 65 psi in the rears (still too much), and need to get Forscan to lower the TPMS setting for the rear.

 

4820 front
3560 rear

Full of fuel, a few tools in box, maybe 50-60 lbs

CCSB Diesel Lariat

 

My fully loaded CCSB F350 diesel, with all my stuff in it but no load in the bed and a full (60 gallon) fuel tank Is 4980 on the front axle and 3920 on the rear axle, 8900 total.

 

Thanks everyone, hopefully I have this figured out now. I’ll weigh each axle after I get my hitch installed (and with a full tank of fuel).

Michelin’s table (https://www.michelintruck.com/refere...tion-tables/#/), assuming their shown weights are for the axle, for my Michelin LTX A/T2 LT275/65R20, I get:

4,160lbs @ 35psi
4,560lbs @ 40psi
4,950lbs @ 45psi
5,360lbs @ 50psi
5,700lbs @ 55psi
6,060lbs @ 60psi
6,390lbs @ 65psi
6,750lbs @ 70psi
7,080lbs @ 75psi
7,500lbs @ 80psi

Until I weigh, I’ll go with an estimated 4,800lb front, 3,500lb rear, So 45psi front and 38psi rear. Is this the way to do it?

And how hard is it to reprogram in FORScan? I’ve never done that before...