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  #1  
Old 02-19-2007
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factory recomended air pressure

correct me if i'm wrong but dont some of the fx4's come standard with 31x1050x15 bfg at's. and if they do can someone who has one tell me what the factory recomended air pressure should be. thanks
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Old 02-20-2007
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FX4 Level IIs come from the factory with 31x10.5x15 BFG all terrains, i put them on my XL last spring, don't know what the factory recomendation is but i run 37psi, gives me a good cantact patch, good wear, handling and mileage
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Old 02-20-2007
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Factory recommended pressure is 30 front and rear.
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Old 02-21-2007
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ya my truck is recommended at 30/30 but thats for a p rated 245-75-16 so i wasn't sure if the trucks that come factory with the 31-1050-15 had a different recommended air pressure since they are lt
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Old 02-24-2007
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factory tire pressures are meant for ride comfort, not control.

my Goodyear ATs 255/70/16 are inflated to 30/30psi stock. I run 38 front/32 rear and I have awesome traction (minimal oversteer), great response, and even treadwear.
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Old 02-24-2007
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I would suggest going with the recommended PSI on the tire.
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Old 02-24-2007
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i run my LT 265 silent armors at 35 psi. seems to work for comfort and traction.
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Old 02-24-2007
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arent u supposed to inflate tires to around the number it says on the tire wall itself?
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Old 02-24-2007
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^ tire is the MAX inflation... it does not take into account the vehicles weight and suspension set up...your not supposed to fill it to that max even though people do thinking its right...

i fill 35 all around just to squeeze some extra milage out...
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Old 02-24-2007
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yea, i never fill up to the max. usually 5-10psi under.
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  #11  
Old 02-25-2007
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Quote:
Originally Posted by blue99ranger
yea, i never fill up to the max. usually 5-10psi under.
dude.. here we freaking go agian... read this now...


Quote:
tires are general there is no read out on the tire that says use this PSI for a ranger/jeep/f-250. the MAX psi labeled on a tire is just that MAX.. you shouldnt exceed that it doesnt mean fill to that point and your good to go..

the PSI on the door/fuel door depending is a # derived by a calculation from the tires that come stock on the vehical what PSI SHOULD be run in the truck for THOSE tires...

see tires have something labeled on them that reads like this... "tire can support 2500lb at 55 PSI MAX".. now say you drive a reg cab 4cyl ranger which weights right around that amount. that means that 1 tire can support the WHOLE vehical weight at 55PSI... there is a calculation, i cant remeber it for the life of me but taking effect the vehical weight with how much the tire can hold at a curtian psi you will get what psi the vehical should be running. i found it once worked out my truck with my old 265 and came out with right around 32psi...

so your statement of running what the tires says well its true and false, the tires do tell you what to do, but you have to do some figuring out.. if the guy is still running stock or a tire with a similar to stock load rating then he should run what is said on the doorjam/fuel door
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Old 02-25-2007
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what you should do is this:

1. get the road or your drive way wet in a spot
2. drive through it until you have driven onto dry pavement
3. get out and check to see how much tread actually touched the ground
4. adjust air pressure until all your tread touches the ground, you may have to repeat driving through the water in a different direction to make sure that all your tread is touching....

i am running 35 psi in the front and about 28 in the rear to get all of my tread to hit the ground....
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Old 02-25-2007
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Quote:
Originally Posted by lifted97ranger
what you should do is this:

1. get the road or your drive way wet in a spot
2. drive through it until you have driven onto dry pavement
3. get out and check to see how much tread actually touched the ground
4. adjust air pressure until all your tread touches the ground, you may have to repeat driving through the water in a different direction to make sure that all your tread is touching....

i am running 35 psi in the front and about 28 in the rear to get all of my tread to hit the ground....
you have to be VERY VERY carful with this recommendation. depending on the tire load and rim width AND tire width you might NEVER have perfect patch contact unless you go extreamly low of a psi which might allow the tire to heat up to much causing a blow out. like my 32x11.5x15 on 15x7 for me to get perfect contact patch i would have to go down around 20psi there is no way in hell i would run 20 psi...
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  #14  
Old 02-25-2007
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that is true.........this only works on a combo like a 12.50 tire on a 10" wheel......a 8" wheel with a 12.50 tire wont work....
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  #15  
Old 02-25-2007
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Ok i think some people got this post wrong. I'm running 32 psi in my tires right now I know not to max out the tire pressure on a midsize truck its not heavy enough. I was just wondering what Ford recommended on their trucks that come with the BFGs stock.
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