I just put 285/70/17 on my 02 fx4 my question is the tire shop told me to run 45lbs in the front and 60 in the back does this sound right? if not what does everybody else run that has this tire size? by the way they are bfg all terrains
thanks

 

Thats very high.

I have 265/75R16 BFGs and I only run about 40 PSI all around. Slightly lower in the back, about 35-38 PSI.

If you haul alot of stuff with your truck, then you will want to jack up the PSI, but otherwise thats way too high for an empty truck and the tires will wear improperly.

 

As those are load range D tires, the 45 sounds about right. I would not go to 60 in the rear unless you are carrying a heavy load in the bed. I would run them about the same as the front or 1-2lbs lower when the bed is empty.

 

That's way to high for daily driving.

 

yeah its a daily driver and rides like **** now would it be best to run 45 all around? will the tires still wear evening

 

I'd use 40psi as a starting point. I wouldn't go lower than what Ford recommends for your truck though (35psi??).

 

I have 285/70/17 BFG A/T. I run 45 PSI in all 4 tires normally. If I am towing a trailer with heavy tongue weight, I go up to 60 PSI in the rear tires. The tires wear well with the 45 PSI.

DO NOT pay any attention to FORD's tire pressure recommendations if you are running any tires other than those that came on your truck. The truck's placard information is relevant only to original equipment.

If any components are changed from original, the new component's specs should be referenced and heeded for safe, efficient operation.

When you change the tires to a type other than factory type, you should heed the recommendations listed on the tire's sidewall. If memory serves, the sidewall of my BFGs indicates a maximum of 65 PSI. The tires are not designed to operate at the lower pressures shown on the trucks placard.

If you run "LT" rated tires (BFG A/T's are "LT" rated) at the pressures indicated on the truck's placard (my truck's placard says somewhere around 35 PSI for the factory "P" rated tire) the "LT" rated BFGs will wear prematurely at the shoulders of the tire.

 

The max psi listed on the tires sidewall is for towing/hauling heavy loads, not for daily driving. While the tires will be ok at max psi, they will ride very rough. If you have any doubts, by all means contact the tire manufacturer and see what they recommend. I bet it will be a lot closer to Ford's recommendation than the max psi listed on the sidewall of their tire.

 

I wore out my 285/75/16 BFG AT's running at 40 psi their whole life. No uneven wear. Almost all the miles were with an empty truck, running on the highway. Any higher pressure and the centre will wear, any lower and the outer edges will wear.

 

on our f250 light duty we run the tires at 50psi- they are either c or d range- dont recall at the moment- and on my f150 i run them at 35 psi as it says in the fuel door. both trucks have goodyear rt/s tires and are wearing perfectly with no rotating so far on mine at 9000 miles and have only been rotated once on the 250 at 30000miles- has 45000 on it now.\

Dan.

 

True statement....as this is the MAX psi rating for the BFG A/T....which is an "LT" rated tire. However, the MAX psi for the stock GY RT/S is 35 psi, because that tire is a "P" rated tire. ("LT" means "Light Truck". "P" means "Passenger Car".) LT rated tires are of a different construction and are designed to be run at higher inflation than "P" rated tires in order to perform as they were designed to perform.

It's a truck, not a Lincoln Town Car. It's supposed to ride like a truck! If you don't want to feel the piece of gravel on the road that you just ran over, don't buy a TRUCK....buy a CAR!
It is pointless to contact the manufacturer for their recomendations, as their recommendations are right there on the tire's sidewall for all to see and heed. ALL tires are designed to run at certain inflation rates regardless of what was original equipment on the vehicle. (Unless, of course you are putting these tires on a Festiva or Escort! )

EXAMPLE........ Ford also recommends 87 octane for the F-150. If you use aftermarket (read other than stock) tuning, ie:SuperChips module or 1715 MAX MicroTuner, that recommends 91 or higher octane fuel, would you still heed Ford's advice and use 87 octane fuel? I certainly hope not. Of course, a sane person would heed the aftermarket vendor's advice and use the appropriate 91 or higher octane fuel to accomodate the deviation from stock.

Installing "LT" rated BFG/AT's is also a deviation from stock and the manufacturers recommendations should be heeded to avoid premature wear and poor performance of the aftermarket part(s).

Here is the key...If the door placard recommends 35 psi, it will also state that the tires on the truck are P265/70/17. Are your BFG All Terrain Ko's P265/70/17? If they are not P265/70/17, then the inflation rates on the placard cannot possibly be applicable to your tires, as they are not the same spec.

Bottom Line.....The door placard is only applicable for FACTORY INSTALLED COMPONENTS.

Sheesh!

 

Important point....are they light truck or P rated tires??