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 > Tire Pressure Accuracy

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Splashers3

Oakville, MD

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Posted: 06/27/19 02:50am Link  |  Quote  |  Print  |  Notify Moderator

When measuring my RV tire pressure I have the TST TPMS, but when checking my tires before each trip, I also use one of those pressure measuring "sticks" (the kind in which you push on the stem and the measurer pops out the bottom telling you what your pressure is). The stick is much easier to use when adding air and with the TST, I have to repeatedly screw on/off...you guys know what I mean.

My quantry - the two systems are about 7-8 pounds different (across each tire, 111/112 vs 104/5). Which system would you trust as being closer to the real tire pressure? My tires are 110 PSI rated. The stick is one of the bigger models, over a foot long, not sure if that means its better than a small style.

Thanks for your help,
Mike


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Lynnmor

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Posted: 06/27/19 04:26am Link  |  Quote  |  Print  |  Notify Moderator

My guess is that your stick is the one that is off. You need to try yet another gauge for comparison, or better yet compare your stick to one that has been calibrated. My TST sensors are within two pounds of each other.





lmpres

New Hampshire

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Posted: 06/27/19 05:18am Link  |  Quote  |  Print  |  Notify Moderator

I have a digital tire pressure guage and it's always about 4 pounds different from the tpms.

fj12ryder

Platte City, MO

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Posted: 06/27/19 06:48am Link  |  Quote  |  Print  |  Notify Moderator

Well, if your gauge disagrees the same amount with all sensors, then I would pitch the gauge and get a new one. One or two sensors could be off but not all of them, and not all the same amount. Time for a new gauge.


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12th Man Fan

Flower Mound , Texas

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Posted: 06/27/19 07:01am Link  |  Quote  |  Print  |  Notify Moderator

Had the same problem. Bought a high quality stick gauge and found out the old gauge was the problem.


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RCMAN46

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Posted: 06/27/19 07:06am Link  |  Quote  |  Print  |  Notify Moderator

I have found with my TST that I set the pressure about 2 psi above my target pressure before I install the TST sensor and most of the time the TST will report my target pressure.

What I consider most important is to get the tires on any axle as close to each other as possible. Then when on the road for more than 25 miles the pressures on any axle should be within a couple psi. If they are not time to determine why.

One time I found a tire that was about 4 psi lower than the other 3 on my trailer. Stopped at the next service area and this is what I found. A 3/8 by 2 inch bolt.

[image]

The TPMS saved me from having a bad tire day.

MFL

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Posted: 06/27/19 07:13am Link  |  Quote  |  Print  |  Notify Moderator

I like the digital gauges from Accutire. They are easy to read, accurate, and a good gauge for the money. I've had worst results with the stick type, but like most instruments, the higher cost versions will likely give the best results.

Jerry





cummins2014

Utah

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Posted: 06/27/19 09:41am Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Well, if your gauge disagrees the same amount with all sensors, then I would pitch the gauge and get a new one. One or two sensors could be off but not all of them, and not all the same amount. Time for a new gauge.



Have used the same gauge for years, had always wondered how accurate. When I bought the new truck in 2014 it showed my tire pressures on the screen. The gauge was accurate almost to the psi. compared with the truck

I installed the TST 507 on the fifth wheel recently. Set the tires to the desired pressure. The TST reads 4-5 psi lower then my old gauge . Truck ,and gauge match, TST does not. Decided to just split the difference with the TST. Not sure I want to get caught up in 4 psi on a 110 psi tire that I run around 100 psi

opnspaces

San Diego Ca

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Posted: 06/27/19 10:46am Link  |  Quote  |  Print  |  Notify Moderator

This brings to mind the old adage. "A man with one watch always knows what time it is. A man with two is never sure."

I agree with checking with another gauge to see what's up. At my local Discount Tire store they do free air checks as well as have a bucket of the stick types for free on the counter. If you have the same I would ask for a pressure check and maybe grab a stick or two and go compare them against each other.


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ACZL

UPstate,NY

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Posted: 06/27/19 11:20am Link  |  Quote  |  Print  |  Notify Moderator

I don't have a PSI mgt system for the trailer, just the truck. Always used a pressure /slide out gauge (small one) until I saw that the reading started to be all over the place. Went to NAPA no parts and bought a long one like OP described and used by our guys in the shop. So far so good.


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