gonna have BFG AT KO's 285 65R 18" load range E installed soon on a 2008 FX4. I had them(BFG's) on my 02' FX4 load range C and ran them with much success at 42 PSI. Being a very different rated tire I'm looking for advice on tire pressure for the E rated ones.

thanks



:santa:

 

I find no higher than 40 in my load range "d" Goodyear Wrangler Silent Armors, the AT/S' that I had ran good at 37-38. I would start at 40 psi for yourself and see how they wear. From what I know about tires, the load range basically means they can sustain more load not necessarily needing more air psi to do so. Like I said, going from load "c" to "d" really mad no difference as far as what psi to keep them at, actually right now they are 38 and are fine.

 

Higher letter tires handle more load but DO need added psi to do so. You will find a load rating (in lbs/kg) on the sidewall and it will most likely say @ max psi or @ 80 psi. My E rated Michelins will carry 3415 a piece at max pressure. I don't need that much and never feel great about running anything at the absolute max so I run at about 70 psi.

You might gain a few mpg's at higher pressure but you also might lose some traction. A lot depends on what you need your tire to do for you. If you're just using it for a daily driver the psi won't matter much.... If you're towing and/or hauling a big load in the bed it's a crucial part of the equation.

 

I ride around on my E's with about 40-45 psi. If I tow I load them up to about 65-70. Just my 2 cents. If i wana air them down for traction off road I may drop them down to about 25-30 psi

 

expect your ride to be slightly stiffer and bumpier.

 

[QUOTE=mSaLL150]expect your ride to be slightly stiffer and bumpier.[/QUOTE

Yeah, I know.....it's a truck :-)

BFG's wear like iron!

 

If they are max 80 psi, run them at about 50. Should give you good ride and wear. Do not go any lower than about 42-44. Then you start getting into the too low range.
At 50 it will handle anything that yo are within the limits of the vehicle. At 40 you would be below what the vehicle can handle.

 

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I am running Cooper Discoverer ATR load E on my F-150. I tow a travel trailer regularly thats why I did the upgrade. When not towing, I have played with the air pressures. I run at 70 in the rear and 65 in the front when hooked up. It is solid and stable. When unhooked, I have been running 62 in the rear and 60 in the front. I still get a little bounce on a bump in the road but I think it is the shocks more than anything... They are getting changed out right after Christmas. 70 when empty is horrendous. You feel everything! You will have to experiment until you find the perfect combo for your truck and driving habits. I am getting great wear out of these tires and the traction is outstanding. They look great on the truck also.

 

thanks all for the advice.....think I'll start at 50 psi and take it from there.
I actually only off-road when surf fishing and I'll take mercedesTech's advice and air down to 25 and see how the truck does at that pressure on the sand.
On my 02' with the BFG's(17") I went down to 20 psi and that truck(reg. cab) was great in the sand. I agree kingfish, when I ran my 02' at the suggested pressure by Ford of 35 psi my gas mileage really suffered, too much tread/rubber grabbing the road surface, around 42 psi solved everything.

thanks again

:santa:

 

I just had the same BFG AT 285/65/18s put on my 05 last week. Discount Tire set them at 45 psi.