HoustonRider

35-40 is low. I would think on a light truck, 45+ would be good. The MAX rating is 80, but unless your hauling/towing its a non-issue.

E rated tires on my F250 I run 70 front, 60-65 rear, largely for a smoother ride. I cna't imagine a E rated tire on this light truck, wear a kidney belt lol

If it helps, the stock BFGs on the Raptor run 44psi.

Steelerfan83

ive been running 45psi in my 275/70/18 Toyo Open ATs. BTW Firestone "isnt allowed" to fill them up past anything on the door for stock tires, 35psi...

orange dream machine

Put what the tire psi is on ur drivers door when u open it the psi on the tire is just the max for the tire doesn't mean u should fill it to that

techrep

iTrader: (1)

That information is based on the stock tires for you truck...we are talking about aftermarket "E" rated off road tires...

Blue King

Like someone said earlier, that's for the STOCK tires. 35 is great for small passenger tires but for larger LT tires you need to increase the psi. I recently just put some KO's on mine as well, 275/65/20, and the shop filled them to 35. Well I didn't even have to put a gauge on them to tell that's what they did because there was a huge bulge in the sidewall. There's no way I'm running any tire like that, no matter what the door says.

To the OP, fill them at least till there's no more bulge. After that, it depends on personal preference and what you're doing with your truck.

rugerchiro

[QUOTE=rugerchiro;2127231]tomb1269 is right on target. The tires you are running on should be at least 50psi or even higher. A couple of other reasons you don't want to run below 50psi (especially at 35psi...thats almost like running on a flat)...you are putting a lot of stress on the sidewalls AND you are killing your gas mileage as well.[/QUOTE]
You will "kill" your Sidewalls at 35 or less than 50psi

orange dream machine

I work for the power company and we have hundreds of f150s in our fleet and some of the door jam stickers say 50 psi yes some say 38 and 35 but and 30 front and 32 rear but if u want tire psi it all really has to do with the terrain u are driving in u won't see and offroad race truck running 50 psi in there tires usually are running about 35 in hard compact stuff and sand even lower I have bead locks on mine so I can go way down on psi but it all has to do with really what u r doing with ur truck if u r towing then yea a tire that holds greater psi is good but for a every day driver that isn't doing that ur just making ur ride stiffer and more bumpy with more psi in the tire just cuz it says let's say 80psi on the side wall doesn't mean u have to have it that high at all

orange dream machine

Dealer ships spend a lot of time and money to make sure they have that psi right on the money for stock tire and normal driving application so to say u r gonna kill ur side wall under that is crazy in a STOCK application that is what it should be put at. They put it there for best STOCK performance and safety for the truck otherwise they would have lawsuits out the *** for unsafe vehicles

techrep

iTrader: (1)

Once again ...we are not talking about a "STOCK" application here.

rugerchiro

What Techrep said. This thread is not about "STOCK". But you are correct about dealerships and tire dealers wont put more than the placard on your vehicle either....which is ridiculous.