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I purchased new tires for my 40 foot rig last September and this has happened 2-3 times. While sitting idle, once in a while my tires will loose pressure. The last time it happened, the stem valve on the inside rear tire needed to be replaced.

I just checked pressure this morning (with Tire Minder) and another inside tire on the opposite tire has lost 20 lbs. We have been sitting for 3 weeks. All other tires are at 115 +/- and this tire is reading 99 PSI. Seem odd that it happens and wonder if these long stem valves are susceptible to failure or slow leaks.

Would love some feedback, ideas, suggestions.

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Are you using the long valve stems installed by a tire shop, or add on extensions? The ones from a tire shop can leak but very rarely do, while the add on extensions have been known to be a problem in leaking if not checked for tightness on a regular basis. If it is always the same tire it could be some other type of slow leak.

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Always have them put in new VALVE STEMS with a  replacement tire. You don't want to run a brand new tire with low pressure and ruin it before it get's any miles on it. There can also be bead issues if you haven't actually broken in the new tires. They need several heat and cooling cycles to relax the rubber and get everything seated well. 

 

Rod

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23 minutes ago, lappir said:

Always have them put in new VALVE STEMS with a  replacement tire. You don't want to run a brand new tire with low pressure and ruin it before it get's any miles on it. There can also be bead issues if you haven't actually broken in the new tires. They need several heat and cooling cycles to relax the rubber and get everything seated well. 

 

Rod

Thanks Rod,

What is bizarre (in my opinion) is why, while sitting idle for a few weeks it suddenly starts leaking. Oh well, will get it replaced but those extenders are presumably more susceptible? Bought the tires last September in Maine, traveled across the country, currently in Seattle.

Thoughts, as to "why all of a sudden"

 

OH, as my wife and I say, "there is always, something." 

 

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On 8/2/2021 at 3:04 PM, Tim and Peggy said:

Thanks Rod,

What is bizarre (in my opinion) is why, while sitting idle for a few weeks it suddenly starts leaking. Oh well, will get it replaced but those extenders are presumably more susceptible? Bought the tires last September in Maine, traveled across the country, currently in Seattle.

Thoughts, as to "why all of a sudden"

 

OH, as my wife and I say, "there is always, something." 

 

 

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Good morning -

 

I went to a tire place yesterday and they will check the tire next week. But what I found interesting is that they will not install extenders. They said they are prone to fail and their logic is pretty sound. I am wondering if you have also heard people saying that.

I called a friend and asked him if he had extenders on his inner wheel and he said no. Will check with local Goodyear dealer to get yet "another opinion."

 

 

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37 minutes ago, jbh said:

As Linda said, long valve stems are the way to go. I've had them nine years, no problems. Tried extenders, which leaked.

I agree with Linda and that confirms my suspicions about these damn things. As Peggy also says, it's only money. But cheaper then new tires.

 

Thanks.

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I had the appropriate pressure "Cross Fire" equalizers installed a few years ago. The next time I purchase new duals I will install a new set. I have had trouble free use and it's great to just walk by and see the pressure is good. 

Some tire dealers dislike them, but I'm sold on them. 

 

Rod

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1 minute ago, lappir said:

I had the appropriate pressure "Cross Fire" equalizers installed a few years ago. The next time I purchase new duals I will install a new set. I have had trouble free use and it's great to just walk by and see the pressure is good. 

Some tire dealers dislike them, but I'm sold on them. 

 

Rod

I've used Cat's Eyes on my rig commercially for many years and perhaps millions of miles. The only failure I've had is when a shop tech broke one. I replace them about every ten years. They've been a tire saver, time saver and stress saver for me. I really like them. Jay

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10 minutes ago, Ray,IN said:

I carry a 6" metal valve extension, If needed I use it then remove it and store in my toolbox until next time.

so absent any monitoring system, how often do you check pressures? I know that I am over thinking it, but I just spent $4,300 for six new tires last year and don't want to buy new ones...thus the monitoring preference and long stems for inside tire (no more extensions...not reliable

 

Thanks

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15 hours ago, Tim and Peggy said:

so absent any monitoring system, how often do you check pressures? I know that I am over thinking it, but I just spent $4,300 for six new tires last year and don't want to buy new ones...thus the monitoring preference and long stems for inside tire (no more extensions...not reliable

 

Thanks

I''ve had a TPMS since 2005, I believe in the system. I use that extension to adjust air when necessary, approx.  2X a year when the seasons change from cold to hot and visa versa.

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25 minutes ago, Ray,IN said:

I''ve had a TPMS since 2005, I believe in the system. I use that extension to adjust air when necessary, approx.  2X a year when the seasons change from cold to hot and visa versa.

so you are not "monitoring the pressures" while you are on the road. I use Tire minder which is fine. Probably over-thinking it..ya think?

Thanks.

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1 hour ago, Ray,IN said:

I''ve had a TPMS since 2005, I believe in the system. I use that extension to adjust air when necessary, approx.  2X a year when the seasons change from cold to hot and visa versa.

We had TPMS, also but we checked tire pressure at least monthly.

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On 8/6/2021 at 2:36 PM, 2gypsies said:

We had TPMS, also but we checked tire pressure at least monthly.

Yup, I monitor my TPMS but verify air pressures with a digital gauge too. Weak batteries can send erroneous readings.

Tim N Peggy, yes I monitor air pressures and compare temperatures while driving. Absolute temperature is immaterial, it's the comparison of temperatures of all tires that is important.

I do not inflate tires by any chart, I go by the Federal Tire Placard in the vehicle. That's why I only need to adjust tire pressure 2X a year, winter or summer temperatures.

Edited by Ray,IN
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23 hours ago, noteven said:

Ray what is a federal tire placard? 

 

every vehicle  you have has these labels either on the door, door post, or inside near driver seat except travel trailers, they have the labels near the LF corner of the trailer exterior.

Safety Info | Toyo Tires

This label shows the OEM tire size, air pressure required to safely support the vehicle when fully-loaded to GVWR.

Edited by Ray,IN
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