FX4CO

Do NOT run them at 35psi! Any good tire shop should know that a 10 ply tire aired down to 35 is a problem waiting to happen. Lets say 4 ply at 35psi can carry 2260lbs and a 10 ply at 80psi can carry 3200. When you air down a 10ply to 35psi it can only carry 1700lbs or so. There is a equation around somewhere for that. Run them at 50psi, that will bring the load rating back up to the 4plys at 35psi

john0270

I would say for tire preasure there should be no more than 7%-10% increase in tire preasure between cold and hot, well thats what I go with on my bias motorcycle tires and I seem to get the best life around the 10% mark(you can over inflate).

BassAckwards

I agree it is not ideal but I think you underestimate the strength of these E rated tires (maybe its just mine since its classified for "Commercial Traction" idk if commercial has anything to do with it being stronger), but I live 2.5 hrs from San Antonio and I had just put on my lift and got my tires from Tire Rack and I put all my new shiny stuff on my truck and made a trip to SA not realizing that Tire Rack only filled the tires to 35 psi, and I was driving 80 most of the way there. The tires held up fine and looking back I think that was a good thing that I didnt realize it because it helped break in the tires, because on I-10 making a turn it really started to float, but they havent done that again since I made it back from SA, and as i said in a previous post I weigh ~5200lbs stock. So to finish my point, I wouldn't dare drive them that low again, but I think the tires are plenty strong to do it if you needed them to.

BassAckwards

Meh, I don't even try to get them in a sweet spot, since they don't last long enough to begin with. I just try to keep them in a spot for good traction that won't blow up from highway speeds, because it's kinda scary to spin your rear wheel @80 miles an hour trying to merge into traffic. So traction is what I go for with a moto tire

Paxford

Little confused about the comments that the BFG's AT's don't last that long. My last set was on an Explorer, they were 31's, and they lasted over 60K miles. Its common knowledge that the BFG's have good tread life (or so I thought). Granted, the 31's I had were not "E" rated. Are the "E" rated tires short lived? Seems counter intuitive, a stronger tire lasting less . . .

BassAckwards

Oh, no, no, no, sorry about that. The person I quoted and myself were discussing motorcycle tires. Sorry about that didnt mean to threadjack and confuse people

Paxford

No worries, I was getting a little worried about my investment in BFG tires for a moment. Thanks for clearing that up.


Since we are a bit off topic I am going to try and reign it in. It's becoming clear that nobody is certain what the magic number is for tire pressure for "E" rated BFG AT KO's on a Ford F150. It may be that the magic number is . . . . tire rotations.

Perhaps somebody new will pick up this thread and shed more light on the subject. Thanks everyone thus far for chiming in. Based on what I have heard so far somewhere between 40-50 psi might be the number for daily driving (not towing). Towing is around 80 psi.

d_nelly78

This is all new to me. I have E rated Dunlop Rover m/t. I am running them at 35 psi. Which is what they were when I had them mounted. Where should I keep the psi. I do mostly highway driving and do not haul too many loads. I want comfort and long treadlife. Please help because I have put 1000 mi on my tires. Don't want to keep damaging them. Thanks

rpfireman

I try to find the contact sweet spot. And that is even different between the front and rear. If you're running 50 psi on the rear I guarantee you that the whole tire is not on the ground. I have 20k on mine and can't see any wear let alone any that's uneven. I had 315's on my last chevy truck and did the same thing. Our half ton f150's are not heavy enough to warrant even close to full psi for non towing driving.

Iron bottom

Pressure is directly related to weight. The tires I have are rated max load 2535 lbs. Max pressure 44psi. So at 44 psi I can carry 2535 lbs per tire. The door sticker recommends 35 psi. 35 psi probably will be about right with a 1,000 lb payload, which is all this truck is rated to carry.

If you want to get really ****, there are charts available from tire manufactures that list inflation rates for various weights. You will, however, have to determine the weight each tire is carrying and adjust the air pressure in the tire accordingly.