dgiancola

wow sounds like i need to pump my tires up...keep them at 35psi...mine are also nitrogen filled or whatever and with this cold weather we been having they look almost flat until they get warmed up...

Taildragger

40psi with a 78% nitrogen mix. 305/40/22

hermiehunter

I have been wondering about this also. I just got a set of 325/50R20 MT Baja ATZs and wasn't sure what to run. I may try them around 40-42 and see how they run.

haha

You have an E rated tire so if you run them at 80 psi you will get better MPG's but they wear quickly.
I ran E rated on my '02 diesel and set the pressure at 65 psi front and back and got great wear out of tire and a good ride.
If you ever have to tow or haul heavy loads, pump up the pressure to 75-80 psi other than that run them about 60-65 psi.

08f150xlt

doesn't the door tag tell you what the stock oem tires suggest for psi? it doesnt mean the same for an LT tire or d/e load tire.... the stock tires(ameritech by general) are very puncture prone, and weak sidewalls-thus its a smoother ride...i had multiple plugs in mine so i went with a larger LT tire(max is 60psi) and im running 55psi in the rears and 50psi in the front... perfect wear after 10k miles.... the tire shop who installed them only put 35psi in them and they looked low just by looking at them, plus when i turned it seemed like the tires were rolling off the rim....so the door tag does not apply to every tire type/style/load range... .02 cents

jamesyarbrough

maybe im a weirdo but im running stock tire size with 38pds like the truck says.
maybe closer to 40 but in between 38 and 40 always. i think they had it figured out when they picked the tires and pressure for my pickup

warewolf38

I run my 275/55 R20 Cooper Zeons at 45, but every time I take it in for rotation, damn mechanic puts it at 35.

D94R

Why are a couple of you guys running the higher pressures in the rear?

You (should) stagger air pressure for load compensation to achieve better tire wear. But unless you are loading the bed or towing nearly 100% of the time, then you want the higher pressure up front to account for the heavier front end of the truck and the consequences of the dire deformity it creates. Higher pressure in front accounts for the weight and creates the better profile for the tire sidewall and contact area for even tire wear front to back.

Having the rear pressure higher is, well, odd.

08f150xlt

I tow

08f150xlt

I dont think its odd if you carry loads or tow all the time? I personally love the ride of my LT285 70 17's with my psi and the help with rear end squat when towing, again it's what works for you and your truck and driving style, btw I just checked my psi and I'm running 48 front and 52 in the rear, and I tow almost daily... Correction from my previous post with my psi....