So I finally pulled the trigger and bought the BFG All Terrains (285/65R20) to go with my Mopar 2" Level Kit. Went to Belle Tire and paid $1450 which included a 3 year pro-rated road hazard warranty, free rotations, free balancing, and free flat repairs for the life of tire. Pretty decent deal I thought.

Only issue I had was that the tech who installed the tires filled one to 50 psi, and the rest to 35. I didn't find out right away, but checked half way up north while towing a snowmobile trailer. I called the store and their response was that the gauge they used at the shop must have been broken. Fortunately those tires are rated to 80 psi, but I feel sorry for anyone else that had regular tires installed that day; hopefully they didn't have a blow out.

Anyways, I was curious as to what everyone else runs their oversized tires at? Belle tire said they only fill them to what the truck recommends on the door (35 psi on the RAM), partly because of the Ford/Firestone issues, but they seem a little too low. Tires list 80 psi cold on side wall; I figured 45-50 psi would be good?

I will get some better pics when the weather gets better here.

 

I would fill to about 40 psi. 50psi if you plan to tow.

 

I have pretty much the same tire but 275 instead of 285 and I keep mine at 35-38 psi all the time. It is a 10 ply tire I do not see the need for the extra PSI. Think about it the factory tire runs 35psi and can tow 10,000lbs so why fill it up more for towing. Disclaimer - I am not a tire tech just thinking common sense to me.

 

Go by what the tire says. In reality, the bigger the tire the less pressure you need because there is more volume of air supporting the load. I would stick with 35 PSI so the TPMs don't freak out. pdavis53 is right - maybe he should be a tire tech

 

i have the same tires on my truck. great tires i run 40 psi at 35 they look like they are low in air. expect your mpg to take a hit but other than that great tires i run bfg at on all my trucks

 

If I'm not mistaken, what the tire sidewall indicates is "max pressure", not what you should run depending on your circumstances.

 

This is a correct statement. Always start at the door jamb sticker, and adjust as necessary. Put 80psi in that tire on that truck, and you'll need an appointment with your urologist ASAP, cause your kidneys will be bleeding!!!!!

 

I was just going by my memory that there is an equation that one uses based on the tire being used. Probably way too much trouble for most of us
https://dodgeforum.com/forum/wheels-...-pressure.html

 

I'd do 40 psi with 'LT' tires. My 05 Lariat called for 35 psi on the door jam since it had the 'P' tires stock. However, my 06 FX4 called for 40 psi on the door jam and it was with 'LT' all terrains stock.

 

Thank you all for the input. Yeah, I would definitely not fill them to 80 psi, but like RX1 stated, they look a little low at 35 PSI. I think 40-45 PSI will be good. I like them so far. I think I am set on upgrades for the time being.

Speaking of towing, what's everyone getting for mpgs? I towed an enclosed snowmobile trailer (about 5000 lbs.) and I was getting only about 8.0 mpg (0 degrees out and tires were about 35 psi) at 65 mph in 4th gear (direct drive according to manual) with tow/haul on. It shifted too much up and down hills in 5th.