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Old 04-09-2009
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Tire Pressure

Now I have done a bunch of searching and it seems that not too many people can agree on what pressure to keep their tires. I have BFG AT ko's and they are 265/75/16. Now I have always heard that you should use the tire pressure that is prescribed by the door sticker, but I cant seem to get a consensus on if that is right or not since the tires are larger than stock. Some people say 50psi, some people say 40 and some say 30. I am just wanting to know if some one actually knows.

Also I was wondering what you guys air your tires down to when you go wheeling?
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Old 04-09-2009
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I would never go over 40, I keep mine between 30 and 35.
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Old 04-09-2009
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I think my door says 33? Don't remember... I run 33s and have them aired at 35
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Old 04-09-2009
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Air pressure for your tires are determined BY THE TIRE MANUFACTURER. Not the vehicle manufacturer. Door sticker means nothing if you've got not-stock tires on your truck. Look at your tire. It'll give you a Max Cold Psi to fill them to.

My current tires tell me a max cold psi of inflation is 35. I run 35 in the front, and about 33 or 32 in the rear.



I air down to approx 15, and sometimes 10psi. Snow wheelin' FTW!
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Old 04-09-2009
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I've still got the stock Wrangler's, my door sticker says 30psi, I run them at 35.
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Old 04-09-2009
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I think generally most people run will run 30-40 in similar sized tires on rangers.
I always got the best wear with 30-35. That is with 265/75/16, and 31x10.50/15. Actually, same with 33x12.50's on 15x8's.
If you are real concerned about it, put them all at 30, and use the chalk line trick. Draw a line across the tread of each tire and drive a short period. If the inside wears out first, less air. If the outside wears first, more air.
I'm betting you'll end up around 35 front, 30 in the rear.
Off road I always aired to 10-20 psi, depending on what I was doing. If I decided I was going to drive home without airing up, 20.
Deep snow or sand, closer to 10. Rocks/sticks and things that are more likely to puncture the sidewall, 15ish to keep a little more ridigity. That's just what worked for me.
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Old 04-09-2009
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i need to play with pressures on mine, someone mentioned driving over a piece of paper to see the pattern
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Old 04-09-2009
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Keep my 31"s at 34
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Old 04-09-2009
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35 is the norm. but if youre good, you will watch them to see how they wear. see if everything is touching the ground but not too low to where is gets sluggish. it also depends on the type of tire. so its different for every application
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Old 04-09-2009
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^^It's different for every tire. Usually cooresponds with the load rating of the tire. Grade C vs Grade E for example.
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Old 04-09-2009
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Quote:
Originally Posted by Fx4wannabe01 View Post
^^It's different for every tire. Usually cooresponds with the load rating of the tire. Grade C vs Grade E for example.
correct, but like the tire, it depends on application also. think about this....265/75r16 load range C max of 50 psi on a ranger and then on an f150. yes its load rated properly. lets say on the f150 at 35 psi works perfect. however, 35 psi on the ranger would probably cause it to cup a little bit and wear a bit funky because the ranger is no where near as heavy. so it depends on everything...


i get the pleasure of driving over a dusty driveway at work everyday. you can see exactly what touches the ground and what doesnt. IMO the best way. lol
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Old 04-09-2009
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^^Good point, Jacob.


In regards to seeing what pattern you are laying down on the ground.....Maurice suggested one time to drive through a puddle, and drive out onto dry pavement. and look at your tread patch.
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Old 04-09-2009
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I run my 265 75 16s load range E at 33
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Old 04-09-2009
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Quote:
Originally Posted by TrucknGolf View Post
I run my 265 75 16s load range E at 33
dang load range e??? thats a lot of tire for the ranger. lol

one person i know has put flour on the ground then drive over it.... it worked....weird enough but it worked.
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Old 04-09-2009
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ive gotten the best wear running 40 in the front and 35 in the rear, no cupping or uneven wear running that combo. i noticed the BFG AT's like a little bit more PSI than other tires ive run.
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Old 04-09-2009
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<--- this tire guy runs 35..
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Old 04-09-2009
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Quote:
Originally Posted by shadow905 View Post
correct, but like the tire, it depends on application also. think about this....265/75r16 load range C max of 50 psi on a ranger and then on an f150. yes its load rated properly. lets say on the f150 at 35 psi works perfect. however, 35 psi on the ranger would probably cause it to cup a little bit and wear a bit funky because the ranger is no where near as heavy. so it depends on everything...


i get the pleasure of driving over a dusty driveway at work everyday. you can see exactly what touches the ground and what doesnt. IMO the best way. lol
you can also draw a chalk line on the tire and drive around a little and watch where the chalk wears off. let air out untill it all the chalk wears off evenly. takes some dinking around to get it right, but it will get you right wear you need to be.
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Old 04-09-2009
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I actually get a pretty good look by pulling in to the garage when it's wet outside.
But it's not perfect anyway. The weight on the front end (also 12.5" tires on 7.5" wheels) causes the front to wear on the outsides a little more from turning, so after watching how the tires are scrubbed in a few thousand miles I made more adjustment.
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Old 04-09-2009
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I work at discount tire and we would send you out the door with 35 psi
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Old 04-12-2009
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it depends i normally run my tires at 55-60 psi.. though i normally have a loaded bed.

but on other trucks i normally air them to 35-40 psi
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Old 04-12-2009
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if you guys actaully read the tire it will say 35 PSI holds 1250lb's (maybe not that exact #)

there is actually and equation to figure out what the psi should be to hold using your trucks weight i dont remember it off hand that would be the proper way to figure out tire PSI
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Old 04-12-2009
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Stock tires on my '04 EDGE Supercab and the door sticker says 30 for front and 35 for rear.
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Old 04-12-2009
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I generally run 35 front, 32 rear. And off road, about 20 front and 15 rear. I like less in the rear cause it weighs less, you get a little better traction, and don't have to worry as much about punctures.
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Old 04-12-2009
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Quote:
Originally Posted by Fx4wannabe01 View Post
Air pressure for your tires are determined BY THE TIRE MANUFACTURER. Not the vehicle manufacturer. Door sticker means nothing if you've got not-stock tires on your truck. Look at your tire. It'll give you a Max Cold Psi to fill them to.

My current tires tell me a max cold psi of inflation is 35. I run 35 in the front, and about 33 or 32 in the rear.
WRONG!!!!!!!!!!

All the tire says is the MAX pressure, it does not tell you the ideal pressure.

The ideal pressure will get you the best wear for the tires. The ideal pressure is what is listed on the door frame. I run my tires between 30 and 35. My door sticker says 30. Remember your air gauge isnt really accurate. If is going to be off by a pound or two.

If you over inflate your tires you will experience cupping in the center of the tire and will wear your tires out prematurely.

Personally when I sell someone a set of BFG A/T's I tell them for the best wear keep them at the manufacturers recommendation, if you want to keep the sidewalls nice and sharp keep them at 50 PSI (unless the man. calls for a higher pressure).




For a quick reference:
Car tires: MAX 44PSI
Load Range C: MAX 35PSI
Load Range D: MAX 50PSI
Load Range E: MAX 80PSI
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Old 04-12-2009
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50 PSI!!!!!!

man your nuts. I could see 50 psi MAYBE on an fullsize that is towing a heavy load, but on a Ranger? BS! That is like riding on a set of hockey pucks.

But your right, you will keep the sidewalls nice and sharp, only because they are not even touching the ground.
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