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I hope I don't irritate anyone with this but I can't seem to get any straight answers as to which type of guage is the most accurate. I have an Accgage and I have a digital-the Accugage is touted to be one of the very best but there is almost 10PSI difference in the readings--Help!!
 

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Trust the digital gage. It has no moving parts. Only a pressure transducer that outputs a calibrated voltage based on the pressure applied to it. You won't get any more accurate than that.

Mechanical gages all employ springs or tubes and by their very design, won't be as accurate as a digital gage that uses a transducer.
 

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Yeah, what Fred said. The only way to accurately determine if your pressure gauge is on target is to compare its reading against a calibrated known standard. In a laboratory environment, the gauge would be calibrated against a manometer or a scale laden with laboratory weights. Also, an analog reading is always subjected to interpretation where when a digital reads 41.5, there's no way to read it other than 41.5.

DanP
 

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Digital tire guages

I spent a career in corporate flight department where every return flight had the tire pressure checked. When digitals came on the market we all got them. They all worked, we tried several brands, for a short time and then would fail. We finally went with liquid filled dial indcators. They are annualy checked, traceable to the bureau of standards. My money is still with dial indicators but nothing cheap.
 

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Tom; when the digitals you purchased "failed", in what way did they fail. Did they quit working; that would be fine. Or did they give errant readings, that wold not be so good.

The digitals are so inexpensive, you could buy many of them for the price of a high end liquid filled analog..

I have had no digital gauge failures yet, so far as I know; but I have no calibration device either.

prs
 

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digital guages

Just for the information the digitals failed. We were checking pressures in the 120 to 190 psi ranges. Thanks for the follow up interest. Tom
 

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Leon Kowalski said:
beauluziana said:
I hope I don't irritate anyone with this but I can't seem to get any
straight answers as to which type of guage is the most accurate.

The most accurate gauge is the one that quickly forms a good seal with
the valve stem -- and doesn't bleed-off several psi every time you take
a reading.

Personally, I favor the better quality (but still dirt cheap) pencil-type
analog gauges. No batteries, no buttons, no guessing about when
they've "finished" making a measurement. I check them occasionally
against two digital gauges (that remain in the garage, next to the air
compressor). My analog gauges (kept on the bike and in both cages)
generally match the digitals within 1 psi -- haven't had a single failure
in several years.

...simple is better than better,

LK

Dittos, Leon.

That's been my practice and results.
 

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If it doesn't say Snap-On I don't trust it. Mine is a spring loaded pencile type gauge which is Snap-On's most accurate in that design.
 

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I got one of these: http://www.moroso.com/catalog/categorydisplay.asp?catcode=27107

The model I've got is accurate to within 2%, and has a bleed valve for fine adjustments. Also, the long hose is really convenient for checking the pressure on the rear tire.

With 40psi, 2% is almost 0.8psi. With most gauges you are lucky if the accuracy is better than 10%, though at 40psi, that's only 4psi or less.

If you really want to accurately know what your tire pressure is, you need to spend some money however.
 

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I found info on tire gauges at WebBikeWorld.com. If interested, take a look at the following website. Just type in "tire guage" to do a search. Maybe it will be useful for you. Ride safely always. :)

http://www.webbikeworld.com/

Todd
 

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Personally, I favor the better quality (but still dirt cheap) pencil-type
analog gauges. No batteries, no buttons, no guessing about when
they've "finished" making a measurement. I check them occasionally
against two digital gauges (that remain in the garage, next to the air
compressor). My analog gauges (kept on the bike and in both cages)
generally match the digitals within 1 psi -- haven't had a single failure
in several years.

...simple is better than better,

LK

[/size][/quote]


I could live with that, and getting on those shortie straight stems some of us are using would be easier too.

prs
 

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any mechanical guage - either pencil type or dial guage type are all affected by the operating range used. If you have a 0-60 PSI guage and are trying to read 15 PSI the guage is too large for an accurate reading and a 0-30 PSI Guage would yield a more accurate reading. a 0-60 PSI Guage would be good for a reading at half way or above the 30 PSI mark for best accuracy.

Also using Nitrogen instead of Air in your tires is even better! It's the only way to go and is very stable under all tempratures!

Hope this helps!
 

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SpaGuru said:
Also using Nitrogen instead of Air in your tires is even better! It's the only way to go and is very stable under all tempratures!
Somebody's been buyin' snake oil...

Air is 78% nitrogen anyway (plus 14% oxygen and the remainder trace gases), and the only way you're going to get the nitrogen pecentage higher is to remove all the air from the tire that was trapped when it was mounted and then filling it with something else. I'd be willing to bet a fair amount of money that a place the claims to fill your tires with nitrogen are just grabbing 78% from behind the curtain.

All gases expand when heated, that's how it works.

EDIT: All gases expand when heated, that's how it works. However, some gases expand less or more than others given the same change in temperature.

I'm not fallin' for that one.
 

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I like those "In Depth" discussions.

Just wonder, In How Deep, and In What?

They seem to represent specialists - and thats when a person knows more and more about less and less, until he knows nearly everything about nothing.
 

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SpaGuru said:
There may be some truth to that, but if its free, it cant do any harm!

See http://www.eng-tips.com/viewthread.cfm? ... 996&page=1 for a indepth discussion on the Nitrogen filled vs. Air filled debate...
In that link, 'pisgahchemist' nailed it every time.


If you are really interested in this subject and would like to get just the facts, and skip the BS and the humor, then go to the thread and read just his postings.
 
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