scammell03

Hey guys, I put leveling kit and 305/65/R18 BFG KO's on my 04 FX4. I was wanting to ask the best tire pressure to run in these tires for best wear. I will be driving on highway mostly very little off road. I will be pulling utility trailer some and hauling ATV. I would really appreciate any advice. Thanks.

Chris

matt1981

well im running 33 12.50 17s and i like running a little higher psi. than the door says 40 to 45 psi should do good you dont want to run much more than that it will make your truck ride like sh*t over rough spots in the road.

scammell03

Thanks, the side wall says 65lb max I was thinking 45-50lb psi. Thanks again.

Chris

Pity7700

dont go with what it says on the tire, go with the set tire pressure for your truck on your drivers side door. it wont hurt to run it a little over but youre guna get a harder ride.

techrep

iTrader: (1)

I run 50 PSI in my BFG Mud's...they also say 65 PSI on them...been running that PSI for 25K now...nice even wear and they are not like driving on rocks.

silverkorn

the 65psi measurement on the tire is a max inflation before it will blowout. i usually run 36-40 psi in my tires, not too hard and not too soft.

but if you are running really high pressures you should check the pressure when the tire is hot to make sure you dont go too high when the air in the tires gets hot.

Platinum_Sean

The door jam sticker is only valid with OEM tires. Once you go aftermarket, its invalid.

If you are towing or hauling a lot, I'd go with what the sidewall says as the max. You'll see the tire rating is, for example, rated for 2450 lbs at 44 PSI. SO do 44 PSI, measured when cold. That is what I run and have had no early wear or other adverse affects. I highly doubt our asses will feel any ride difference between 44 and 38 psi, so that means nothing to me.

If you measure your pressue cold there is no need to re-measure when hot. The tire and air expand with the heat which is all taken into consideration when the tires are rated. You would go crazy putting air in, and taking air out, if you measured at different times of the day or trip.

I

scammell03

Thanks guys for all the help. So it will not have any ill effects if I run the 65psi as the sidewall says? I will be towing more than usual for the next couple months(hunting season) i just don't want to wear the tires to fast or round off the edges of these tires they cost quit a bit and I won't have the coin for another set real soon.Thanks again.

Chris

Platinum_Sean

As long as the rims can support 65, then no ill effects. I run 65 on the 4 wheels on the 5th wheel trailer that I tow, no effects. 85 on my seadoo trailer, no effects. And 44 on the truck with, well, you know.

Keep them balanced, the truck aligned, and you are good to go. You might even get a hair more gas mileage, but that would be tough to prove or disprove.

techrep

iTrader: (1)

Don't go with what it says on the tire ???