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Get tire pressure indicators!

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tmsnyder:
One of the main causes of tire blow-outs is an under inflated tire.  They build up heat faster than they dissipate it then fail by delaminating.  That's my understanding of it anyway.


So I check air pressure pretty regularly, even during a trip.  (And I feel the tire temperatures when filling up with gas)


Pulling off the valve stem caps and checking each tire with my pressure gauge was getting a little tiresome so I bought two sets of these:


https://www.amazon.com/gp/product/B07BFBN76B/ref=oh_aui_search_asin_title?ie=UTF8&psc=1


They replace the cap with a pressure indicator.   I inflate my tires to 90 psi, so I bought the 100 psi variant of these caps.  The top/sides of the indicator shows green when the tire is at 100% pressure rating, yellow when it's low, and red when it's really low.  I don't have the instructions in front of me, but it was something like yellow is 75% pressure, and red is 70%.  Something like that. 


At 90 psi, they are all green with a tiny bit of yellow showing.   I have one tire that has always had a slow leak, these didn't change the leak for better or worse.  And the rest of the tires don't leak at all, even with these installed. 


I really like them, now I can just walk around the rv and look closely at the indicators to see if they are properly inflated.  They are not the easiest things to see b/c they are small and you need to look at them from the side, but they are a heck of a lot easier to use than unscrewing the cap, gauging it, then screwing the cap back on. 


Something to consider to make travels safer and easier.

Sasquatch:
You are only seeing half the equation.  The other half is temperature.  You fill your tires to 90 psi COLD.  Cold means 65 degrees F according to the tire industry.  Your tire will gain about 1.5 psi for every 10 degrees above 65 psi.  Seeing 140-150 degrees on a warm day is not uncommon.  (195 degrees is the max for most tires)


90 psi cold
150 degrees
Your tire should be at 112 psi  That is 22 psi over your cold inflation pressure, and exactly where it should be.


If your tire is hot (like at a mid day fuel stop), and your tire is at 90 psi where your little monitors show green so all is good, you are actually 22 psi under inflated for the temperature.  So even when your monitors show green, you are under inflated.


That said, you would not be critical, but you would be low.  Some warning is better than none.


This is the system I have in my coach, and one that I hold a patent on and worked 15 years on to develop.  I have done more tire pressure/temperature comparisons than I care to remember.  (Dont get me started on nitrogen in tires...)





It measures absolute pressure and temperature inside the tire.  It then calculates what the pressure should be at any given temperature (based on your programmed cold inflation pressure) and then gives you a deviation number where it tells you +/- psi from where it should be.


My suggestion to you is to get an understanding on what pressure your tire should be at any given temperature, then when you check it with a gauge, you will know where it should be.

Rickf1985:
I have tried for years to find someone who can tell me what the recommended tire temperatures should be. That is what I set my initial pressure by since the door panel tells me 65 lbs. which is waaaay to low and when the tire shop put them at that they were at the 150 degree mark just on the ten mile ride home at 40 MPH!! I have been running them at 80 and the temps stay around 120. The problem with Sampson is they do not provide a weight/pressure chart.

ClydesdaleKevin:
What a brilliant idea, tmsnyder !

Not a bad price either on Amazon!

How long have you been using them?  I would be concerned with a leak from the cap if they failed.  So far, I've been checking my pressures with a gauge before every trip, and then using a tire bat when fueling up to "listen" to the tire pressures before getting back on the road.  These look like a much better idea that the old tire bat.

Kev

BrandonMc:

--- Quote from: Rickf1985 on February 26, 2019, 10:07 AM ---I have tried for years to find someone who can tell me what the recommended tire temperatures should be. That is what I set my initial pressure by since the door panel tells me 65 lbs. which is waaaay to low and when the tire shop put them at that they were at the 150 degree mark just on the ten mile ride home at 40 MPH!! I have been running them at 80 and the temps stay around 120. The problem with Sampson is they do not provide a weight/pressure chart.

--- End quote ---


I've been looking for an old thread you posted about tire psi trying to figure out what to run my tires.  I run the Bridgestone Duravis 500 HD. Probably going to shoot for 75psi and see how that does after running 60psi from what the door calls for on the old 7.50x16


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