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Discussion Starter · #1 ·
I have 3 guages and on the same tire one measures 30 psi, another 35 psi and the third 40 psi.

I think it's time for something better so what do you recommend?
 
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Discussion Starter · #2 ·
Skully : I have 3 guages and on the same tire one measures 30 psi, another 35 psi and the third 40 psi.

I think it's time for something better so what do you recommend?

I even bought a digital one but I realy think it's a piece of  

edit: I'd like to get me one of these?
 
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Discussion Starter · #4 ·
Try not to get the one with a hose. It takes too much air out of your tire each time you check it.
 

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www.randys-racemart.com
Quickcar!

I have the above and its tight. The liquid with a rubber shell combines so when you drop it, it doesent get its a$$ kicked, mine still looks new after a year or so and is spot on (I got 0-40psi).

Though Im in the market for a new one - and I found a nice 0-20 @ this flight supply place...hmm but Ill prolly get another quickcar, they are good for the $$ just be careful if you get the liquid filled one and you live in a COLD place, cause they dont like that (as the bleed valve will demonstrate ).
 
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Discussion Starter · #7 ·
Which brings me to ask, 'How on Earth do you know it's spot on?' I mean Who has the standard and who calibrated it?
 
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Discussion Starter · #9 ·
nedro : Which brings me to ask, 'How on Earth do you know it's spot on?' I mean Who has the standard and who calibrated it?
they must use an known sized air-chamber/piston and a set of scales...
 

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nedro : Which brings me to ask, 'How on Earth do you know it's spot on?' I mean Who has the standard and who calibrated it?
pneumatic test source for calibrating process control equipment (with differential compensation of course). Anything less is uncivilized
 
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Discussion Starter · #11 ·
Skully : Quote (nedro @ May 23 2003, 5:18pm)Which brings me to ask, 'How on Earth do you know it's spot on?' I mean Who has the standard and who calibrated it?
That's what I was wondering.
Actually, I do ... that's what I do for a living I'm a metrologist. No, not a weatherman .. that's a meteorologist!

BTW, the guage I bought from Fastlap is the same Quickcar one SomeStrangeGuy is talking about. Good [email protected] guage.
 
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Discussion Starter · #12 ·
red929 : Quote (Skully @ May 23 2003, 7:51pm)Quote (nedro @ May 23 2003, 5:18pm)Which brings me to ask, 'How on Earth do you know it's spot on?' I mean Who has the standard and who calibrated it?
That's what I was wondering.
Actually, I do ... that's what I do for a living    I'm a metrologist.  No, not a weatherman .. that's a meteorologist!

BTW, the guage I bought from Fastlap is the same Quickcar one SomeStrangeGuy is talking about.  Good [email protected] guage.
So is there a way to check the accuracy of your guage? I'd like to be able to do that if possible. Even if you buy a new guage there's guarranty it's accurate. I've had the same Blue Point dial guage 0-100 psi for 15 years or more and still trust it. But why? Who knows.
I have 3 regular stick type guages also and just checked them on the same tire I got 36 on the dial, then 31 32 and 34 on the sticks, then back on the dial one more time at just over 35 (loss of air).
I would think the dial would stay more accurate because the stick type uses friction on the meter and would change with age, But that's just a guess.
 

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Next time you're at an AMA race bring your gauge(s) and swing by the Dunlop tent.  They have a tester for verifying a gauge's accuracy.  The racers use it to insure the pressures they're running will be the same as the pressures Dunlop recommends for the day/race.
 
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Discussion Starter · #14 ·
nedro : Try not to get the one with a hose. It takes too much air out of your tire each time you check it.
that is the only type I can fit to my front tire. the others are just too big
 
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Discussion Starter · #16 ·
Quickcar tire pressure gauge, liquid filled

More interesting stuff

'The most accurate instruments available for measurement of pressures above the range where manometers may be used is the Deadweight Tester.This type of tester operates on the principle of balancing a known mass against the force exerted by an unknown pressure on a piston of a known area.When an exact balance is achieved,the unknown pressure P is equal to mass M of the weights divided by the area A of the piston,according to the formula P=F/A.' PDF link with calibration machine diagram

not bad eh?
Quote they must use an known sized air-chamber/piston and a set of scales...
 
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Discussion Starter · #17 ·
I was searching through the old threads for in on tire pressure gauges. I was wondering how the heck you know the gauge is right. I have two accu-gages and a no name digital. The two Accu-gage dail type gauges (one with a hose and one with out) which read 35 & 37 and the digital reads 37.5. I use to have a digital one from roadgear that I always trusted but can't seem to find it now.

Those liquid filled ones from quickcar look nice.
 

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Northy said:
Those liquid filled ones from quickcar look nice.
I dunno...glad this link was posted as earlier tonight I was using mine to check the pressure on some tires. I like the liquid filled stuff but mine seems to be leaking. I thought it was just glycerine inside, but whatever it is has made its way out of the bleeder valve on more then one occasion - and the blue rubber bumper thing is all cracked and I have made a conscious effort to be gentle to this gauge. I think the escapee fluid has eaten away at the rubber cover.

Though the gauge itself is still accurate, enough fluid has leaked from it that it is 3/4 full now and beleive I may not get the most accurate readings from it due to the fact that the needle now has to re-enter the slime. The readings on mine always seem to lurk suspiciously near the surface of the liquid :idunno:

OTOH - my accugauge that has spent the last 4+ years in a toolbox in the back of a truck, on the trail, whatever...aside from a cracked gauge face is perfectly fine, though has always had a little bit of difference from the quickcar ;)
 
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Discussion Starter · #20 ·
Thank for the info SSG. I've got two accu-gages and they're both very consistant. Just consistantly two psi off from each other. I don't know which one is right. :idunno:
 
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