dcfluid

I too have run 10 ply tires on one tons for years. The tire manufacturers and tire dealers are the ones recommending minimum 50 psi in a 10 ply. There is probably a good reason. Ask some of them to clarify why that is....

69428SCJ

Will not feel any difference?? It is night and day driving an E rated tire at 60 PSI versus 80 PSI. Its not even close. The truck bounces all over the place on rough roads and is just plain harsh in everyday driving. I drove one tons for 16 years and you can certainly tell the difference. The E rated tire NEVER NEEDS TO BE on an F150. The truck can't even come close to maxxing out an E rated tire. It can't even max out the factory tires.

dcfluid

I can tell the difference between my 6 plys and my 4 plys. I can feel 5 psi difference easily (40 to 35). My wife can feel one tire down 3 psi on her Pilot. My one tons easily feel a difference between 50,60 and 80 psi. Loaded 70 to 80 makes a difference.
It's a little bit ride, stability, and handling combined when it comes to tire choice and pressures.

PawPaw

Every LT tire I've had rides great at 42 to 44 psi when empty. If towing something heavy I go up to around 55-60 psi in the rear and 50-55 psi in the front. Door jamb info is for the stock tires only! Running the max psi on the sidewall's when truck is empty will rattle your eyeball's!

dcfluid

The DOT sticker for tire pressure is determined by what tire came on the truck from the factory. P series, C load range and E's all have different pressures on the door sticker AND Ford programs the TPMS to match the tires that come on the truck.
My neighbor got his 11 Ecoscrew with the 10 plys and switched to C's because they were too rough. Much too his chagrin the TPMS won't allow less than 50 psi and cannot be reset for a lower amount.
Buyer beware.

69428SCJ

Your butt meter must be as good as mine. My wife's previous car an 06 Lexus RX400h had no tire pressure sensors whatsoever. I would check her tires when I changed the oil every 3.5K miles...about once every other month. Her tires were usually 2-3 psi low. She could feel the difference when I aired them back up to 32.

69428SCJ

Charts use to be readily available on line to convert the PSI to weight, but have all but disappeared after the Explorer tire pressure issues.

smokeywren

The lawyers have screwed up the facts on tire pressure so much that the tire companies now just say to follow the vehicle manufacturer's recommendations. The vehicle manufacturers all understand and approve of load/inflation tables published by the Tire and Rim Assn (TRA), but there's not room on the door sticker to put much info. So they put only the max PSI the tire should ever need. However, if you look hard enough you can still find the load/inflation tables for LT tires (but maybe not for "P" tires that come on some F-150s).

F-150s come with various sizes of both P and LT tires. My 2003 SuperCrew 4.6L shorty has P275/60R17 with max weight capacity of 2,337 pounds per tire @ 44 PSI. The pickups with the max payload pkg have LT245/75R17, and I suspect they are load range D with max weight capacity of 2,755 pounds per tire @ 65 PSI.

Here is the load/inflation table for LT245/75R17.

PSI . max load per tire (lbs)
--- . ------------
35 . 1770
40 . 1945
45 . 2110
50 . 2270 max for load range C
55 . 2430
60 . 2595
65 . 2755 max for load range D
70 . 2900
75 . 3050
80 . 3195 max for load range E

So load your pickup to the way you normally drive it when "unloaded", then go to a truckstop that has a CAT scale, fill up with gasoline, and then weigh the pickup with driver on board. Note the weight on each axle, then divide that weight by two to get the approximate weight on each tire. If the weight on either axle is less than 3,480 pounds, then you need 35 PSI in the tires on that axle when "unloaded". As the table indicates, you should never have less than 35 PSI in your tires, but for any tire that carries less than 1,770 pounds, 35 PSI is fine and dandy per the engineers at TRA .

Next, load the truck to the max (including trailer hitch weight if you tow). Then use the table above to determine the max PSI you would ever need in the tires on each axle. For example, if the weight on your rear axle is between 4,860 and 5,190, then you need 60 PSI in your rear tires.

sled92

I would guess that they are trying to cover their butts. As I said there are bunch of us that have been airing down our 10 ply tires (15- 30 psi) for years with no issues.

Some people actually take their trucks off the pavement. E-rated tires are very puncture resistant compared to the factory "car rated" stock tires. So maybe keep your 'blanket statements' to yourself.

ftrucktough

125PSI will work best