Proper air tire air pressure - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 07-21-2007
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Proper air tire air pressure

Ok Im ready to get my ***** busted for asking a question a ditsey house wife may ask but : I have 04 ranger xlt with P245/75/16 tires sitting on factory 16's of course. But the sticker in the inside of the door says to inflate to 30 psi. To me the tires inflated to 30psi seems kind of underinflated. Is 30 psi correct? Anyone with the same tire/wheel package what do you inflate your tires too? The tire itself says 44psi max....
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Old 07-21-2007
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go by the door sticker, it accounts for the trucks weight and body roll along with other factors
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Old 07-21-2007
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Quote:
Originally Posted by jtslmn720
go by the door sticker, it accounts for the trucks weight and body roll along with other factors
I guess your right, it just seems like 30 psi is not enough air. It does say 30 in the door jam. What are signs that a tire is underinflated while driving?
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Old 07-21-2007
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Quote:
Originally Posted by n0thing43
I guess your right, it just seems like 30 psi is not enough air. It does say 30 in the door jam. What are signs that a tire is underinflated while driving?
is your pressure gauge correct?
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Old 07-21-2007
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Disadvantages of Underinflation

An underinflated tire can't maintain its shape and becomes flatter than intended while in contact with the road. If a vehicle's tires are underinflated by only 6 psi it could weaken the tire's internal structure and eventually lead to tire failure. Lower inflation pressures will allow more deflection as the tire rolls. This will build up more internal heat, increase rolling resistance (causing a reduction in fuel economy of up to 5%) and reduce the tire's tread life by as much as 25% while increasing the probability of irregular treadwear. Drivers would also find a noteworthy loss of steering precision and cornering stability. While 6 psi doesn't seem excessively low, it typically represents about 20% of a passenger car tire's recommended pressure.
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Old 07-21-2007
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Its a conspiricy with the tire manufacturers and auto-makes so the tires wear down faster and people have to buy new ones sooner!

I've had my stock Goodyears at the sidewall recommended pressure of 41PSI since the day I bought the truck. The things are now almost 5 years old and still not worn out yet. Which sucks, because I hate them.
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Old 07-21-2007
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id go 35, that seems to be the standard, do 35 up front and 32/33 out back (bc of less weight)
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Old 07-21-2007
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Quote:
Originally Posted by 07Ranger
Disadvantages of Underinflation

An underinflated tire can't maintain its shape and becomes flatter than intended while in contact with the road. If a vehicle's tires are underinflated by only 6 psi it could weaken the tire's internal structure and eventually lead to tire failure. Lower inflation pressures will allow more deflection as the tire rolls. This will build up more internal heat, increase rolling resistance (causing a reduction in fuel economy of up to 5%) and reduce the tire's tread life by as much as 25% while increasing the probability of irregular treadwear. Drivers would also find a noteworthy loss of steering precision and cornering stability. While 6 psi doesn't seem excessively low, it typically represents about 20% of a passenger car tire's recommended pressure.

dont listen to this its poppycock!

go buy the door sticker, ford knows better then he does!
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Old 07-21-2007
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lol i just copyed a google page lol, im to lazy to write that long. oops!

Last edited by 07Ranger; 07-21-2007 at 10:01 PM.
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  #10  
Old 07-21-2007
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factory ranger tires: run 30-35 psi.
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  #11  
Old 07-21-2007
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Quote:
Originally Posted by 07Ranger
lol i just copyed a google page lol, im to lazy to write that long. oops!

i think thats called Plagiarism?
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Old 07-22-2007
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it is but dont we all do it? and u can clearly tell i wouldnt be that organized. if ur offended im srry!
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Old 07-22-2007
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no no im not, i just wanted to be sure you knew.
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