OK, first one ton truck owner.

Why are my rear tires at 80 psi? and do I have to keep them that high when empty?
I think the ride will improve with like 55 psi, but I dont want to kill the tires either. Any suggestions?

ysgi

 

I run mine at 55 front abd rear and it is a great improvement. 80 is ridiculous unless you're towing the whole time. Also sandbags in the back help a lot.

 

its a CYA thing, 80 psi in rear at or near empty will kill your tires
scroll down to page 25 of this pdf
https://toyotires-1524598101.netdna-...s_20151020.pdf

good reference to how much psi for a certain load

 

The door sticker, which on an F-350 is typically 65psi front and 80psi rear, is what the manufacturer recommends. You will get the longest tire life, best fuel economy, and highest payload capability at these pressures.

That said, you will also get the worst ride quality unladen. Plenty of members here have run lower tire pressures without issue.

F-250 trucks run less pressure because they have less payload capacity...but they may well be running the exact same tire as the 350 truck. This proves CYA's point, but it also indicates you can safely run higher pressures in a 250 for better fuel economy if you so desire.

My 2017 dually sticker states 75psi front and 65 rear.

 

how low can the pressures go before the light or warning is triggered?

 

Rear sustained below 65 your light goes off in a 350srw
I am currently running 65 front 55 psi cold rear in my toyos with good wear and much better ride. Changed my tpms with forscan
Havent towed heavy yet just mild hauling

 

Thanks. My truck is 2 weeks old and the heaviest thing I hauled was Christmas Presents so far.
I have to admit that even at those pressures the ride isn't HORRIBLE, just feel it could be better - so does the Mrs.

PS - I am a Big fan of Orange as well.

-ysgi

 

At 68 in rear 62 in front

 

... dup post

 

On my 2015 I had the dealer lower the tpms warning down to 50 psi so I could adjust according to my load.