Hey I was wondering what tire pressure you guys run?

I'm running 285-75-16 BFG MT's on my 2003 7700 Series F-150

What do you recomend for a pressure? Should it be different in the winter and summmer? And should it be different for the front and back??

Thanks

 

Each tire is different. I'm running ProComp AT's 285-75 r16s and run in the 20s front and back. I'll have to recheck to get exact numbers. The best way I know to get the longest tire life is to drive through water or chalk and check the tread pattern that is left on dry pavement. You want to adjust the pressure to the point where all the tread is contacting the road. You may have trouble if you're running a 285 on 8" or narrower rims, but you should be close. Generally speaking if you're not constantly carrying loads in the bed, than you'll have lower pressure in the rears due to the lighter load. I've gotten 40,000 on my tires and they are only half way down. There's PLENTY of tread life on mine.

 

Those tires are Load Range D tires. I would start at about 45 and see how the do. I would not go below about 42.

 

ok guys thanks for the info

I think I will try 45 in the rears,,, and 47 in the fronts...

I will also see if I can check the tread pattern with the puddle trick..

Thanks guys

 

If you really want to know here is a O.C.D. way to check it FOR SURE:
Get some basic sidewalk chalk (steal some from your kids of you have any). I used yellow because it shows up good on the black tire tread. Anyway, chalk a 3-5 inch section of the tire clear across the tire tread from one end to the other on each tire (do it in the direction of drivers side to passenger side). Then drive around the block (be sure to go fast, slow, make right & left hand turns just as you normally drive). When you get back home see what chalk is left on the tire. What you are looking for is no chalk left on the tire tread whatsoever. If there is chalk left on the edges of the tire tread, decrease air pressure, if there is chalk left in the center of the tread, decrease air pressure. I increased & decreased about 2 psi each trial run & here are my results for my 2000 f150 supercab 4x4 with 265 75 16 BFG A/T's:
42 front & 40 rear
PRESTO!
I don't know if you are goofy as I am & actually care that much about tire pressure but after paying $800 for my tires I want them to last!!

Good luck,

Brian

 

Not to hijack your thread but since we are on tire pressure, I have some Cooper AT tires that says the max tire pressure is 50 psi. I don't have a clue what psi to put in them. I don't haul or tow, so I've been running them a 36 psi front and rear. Is that ok, or do they need to be pumped up closer to the max 50 psi? Would 42 up front, and 40 in the rear sound about right? Thanks for any help.

They are an LT255-70-16 load range "C" tire.

Thanks,
Peace...

 

That sounds like a good place to start. You should not have to run the 50lbs unless fully loaded. The 50lbs is the max.

 

Thanks. I'll try that and see how it works out.

 

My LR C tires are run at 40 all the way around per the door sticker. 38-40 would be about right on an F150. As you have an 01 F150 which is a bit lighter, try 38.

 

Well I just went out to the garage and grabbed an LED flashlight, and checked the max psi on the sidewall of my tires, and it said 35 psi max. So, I put 34 psi in the front, and 32 in the rear. I would have bet a million dollar monkey it said 50 psi last time I checked? Must have been my Mom's 4-Runner I was thinking about. Anyway, I think those pressures should be good enough, since They are close to the max psi. I checked them before I put air in them, and they all read about 26-27 psi cold. That's way too low! They didn't "look" low to me. Must have been the thick sidewalls?? But I'm "DOUBLE DOG GLAD" I checked them! That right there might have saved me an accident or worse if I had let them go without checking them! They had been a bit noiser than usual lately. Now I know why! "EVERYBODY CHECK THE AIR PRESSURE IN YOUR TIRES THIS WINTER!" Mods, that would make a good sticky for the wheel and tire forum. Thanks for all the help guys!

Peace...

Edited to add: I put 35 psi in all around and the ride is no different than when I had 32 psi front, 34 rear. The tire noise is gone, and it handles a little better. I'm waiting to get some Rancho shocks for Christmas. That should help make the ride more comfortable. I don't think I can hold out much longer. Lol.

 

So you have P series tires. I think the truck would handle better with LT tires on there. IMO P (passenger car) series should not be put on an SUV/truck. They just aren't heavy for the loads put on them.
If the shocks are OE, definitely replace them as they are probably shot by know.

 

It says "LT" on the tire, not "P". LT255/70/R16 is what it reads. Load range "C". I think the reason the max psi is so low, is because it's an AT tire. They're made by Cooper, but they are called Mastercraft Courser AT's. Here's a link that shows the specs of the tire. Scroll down to the P255/70/R16 to see.

http://www.mastercrafttires.com/us/e...ht+Truck+Tires

 

Went to the site, unfortunately they don't show pressure on the there. That's a new one on me. Every tire I have seen with a max of 35 was a P series tire. All the LR C tires I have had, had a max of 50. I have seen non-metric LR C tires with a max of 35, but not metric.
You probably don't need the max, but I would keep it at 32 or above and see how it wears.
Learn something new everyday.

 

Thanks for the advice. And I'm glad to assist in learning you something new.

PS- I double checked the max psi on my LT255/70/16 tires just to make sure I wasn't seeing things, and it still said 35 psi max. Must be the thick sidewalls.

 

Thicker sidewalls usually have a higher max PSI.

Edit:
For example, check out BFG's tires:
http://www.bfgoodrichtires.com/asset...rain_ta_kd.pdf
Most of the LR C tires have a max PSI of 50 and some at 35 (the psi listed for the max load is the max psi). The D range tires are all 65 PSI max. Then the LR E tires are at 80 PSI.