Air Pressure Guage
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Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
Air Pressure Guage
I have 4 different Air guages and when I check them all against the same tire one righ tafter the other I get 4 different readings.
I have a round dial guage
A digital guage
A long skinny slide out guage
And a different shaped dial guage.
All four of these will give a different reading on the same tire.
Is there any type of a constant I could check them against?
Is there any way to know if one is more accurate than another?
Please help I would really like to know the truth here!!
I have a round dial guage
A digital guage
A long skinny slide out guage
And a different shaped dial guage.
All four of these will give a different reading on the same tire.
Is there any type of a constant I could check them against?
Is there any way to know if one is more accurate than another?
Please help I would really like to know the truth here!!
Posting Guru
Joined: Sep 2004
Posts: 1,616
Likes: 3
From: Sapulpa OK
The tire is a pretty good constant providing there was no change in temperature while you were testing the gauges. Generally speaking you get what you pay for in gauges. If you want an accurate one you have to pay for it. It has been my experience over 40 years of working with compressed air that run of the mill pressure gauges will vary ± 10% although they are advertized @ 2% accurate in the center 1/3 of scale.
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Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
haha so I should buy the most expensive guage check my tire then see how much my digital guage is off and just add or subtract that everytime i check my air...
and get my money back for the expensive one haha ?
and get my money back for the expensive one haha ?
Senior User
Joined: May 2005
Posts: 102
Likes: 0
air pressure guage
When I was racing, we would use oil filled guages. Not cheap, but extremely accurate. Depends on your needs. As long as you use the same guage on all of your tires, there should not be a problem. And remeber that the pressure stamped on your tire is a suggested running psi. Depending on load, and desired performance will determine your actual running psi.
Posting Guru
Joined: Sep 2004
Posts: 1,616
Likes: 3
From: Sapulpa OK
The pressure rating on the tire is the maximum allowable. The correct pressure is set by the vehicle manufacturer and is usually located on the drivers door post. Sometimes it is located on the sun visor, glove box door, passanger door post and always in the owners manual.
Running the max pressure will result in a harsh ride and excessive tire wear. Tire stores here in So. Cal. always fill them up to the max claiming thats the safest pressure. I wonder how many tires they sell to replace tires that have worn out in the center from overinflation????
Running the max pressure will result in a harsh ride and excessive tire wear. Tire stores here in So. Cal. always fill them up to the max claiming thats the safest pressure. I wonder how many tires they sell to replace tires that have worn out in the center from overinflation????
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
I have found the most accurate gauges (for the money less then $30) are truck guages that go to 140-160 psi. I have returned both round and pencil guages when I tested them against my good gauges and found them way inaccurate.
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Laughing Gas
Joined: Nov 2003
Posts: 794
Likes: 3
As far as what Ford claims to be my best airpressure is a joke.
29 in the front 32 in the back
97 4x4, with 265x70R17
The tires would scream going around gentle corners the truck would lean... I couldn't believe this is what they want to claim I should use.
I like 32 front and back... Or I think I'm putting 32 in them haha
My 10 dollar digital guage from Autozone, what do ya'll think of it as far as accuracy compared to the ones i mentioned?
29 in the front 32 in the back
97 4x4, with 265x70R17
The tires would scream going around gentle corners the truck would lean... I couldn't believe this is what they want to claim I should use.
I like 32 front and back... Or I think I'm putting 32 in them haha
My 10 dollar digital guage from Autozone, what do ya'll think of it as far as accuracy compared to the ones i mentioned?
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Fleet Mechanic
Joined: Jul 2005
Posts: 1,464
Likes: 104
From: Staten Island, NY
Of all the guages I've used, I have to agree Dan Tenn. Get an oil filled guage with a short hose and a SCREW ON chuck. Most of the push on guages use a little rubber washer gasket to seal to the valve stem. They do a crummy job of sealing and get worse as they get colder.
The stick guages use a plunger and spring. Not too accurate, but fairly repeatable. You get what you pay for.
Most of the 10 buck round guages are junk. Don't waste your money.
The cheap ($10 - $25) digital guages are not temperature compensated and are not linearly inaccurate. At 29 lbs. they might be plus or minus 2 lbs. At 80 psi they might be plus or minus 7 or 8. They tend to be more inaccurate as the temperature goes down. The expensive ones ($75+) are temp. compensated and self calibrating but I haven't seen any with a hose and screw on chuck.
I've got both a digital and an oil filled. Digital is quick, oil filled is accurate. Take your pick.
The stick guages use a plunger and spring. Not too accurate, but fairly repeatable. You get what you pay for.
Most of the 10 buck round guages are junk. Don't waste your money.
The cheap ($10 - $25) digital guages are not temperature compensated and are not linearly inaccurate. At 29 lbs. they might be plus or minus 2 lbs. At 80 psi they might be plus or minus 7 or 8. They tend to be more inaccurate as the temperature goes down. The expensive ones ($75+) are temp. compensated and self calibrating but I haven't seen any with a hose and screw on chuck.
I've got both a digital and an oil filled. Digital is quick, oil filled is accurate. Take your pick.
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Laughing Gas
Joined: Jul 2004
Posts: 1,245
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Originally Posted by fixnair
The pressure rating on the tire is the maximum allowable. The correct pressure is set by the vehicle manufacturer and is usually located on the drivers door post. Sometimes it is located on the sun visor, glove box door, passanger door post and always in the owners manual.
I inflate my tires to what's listed on the sidewall and then just monitor tire wear accordingly. If I feel that I'm wearing out the tires due to excessive pressure I'll drop them a couple of psi, but generally I've had no problems running the maximum pressure aside from a tiny bit of additional harshness over bumps.
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