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Old 04-05-2014, 02:39 PM   #57
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Yes, if you put TPMS sensors on your valve stems, you should switch the default rubber stems out for metal ones. However, unlike too may people on too many threads in this forum, I'll cite a source to show this is based on more than a fact-free opinion:

On this web page from this manufacturer: FAQ |TST Trucking Systems

It says the following:
"Do I need special valve stems?

"No, you do not need special valve stems, but you do need commonly available metal valve stems.

"The added weight of the sensor on a rubber valve stem could cause problems that will be avoided by using metal valve stems.

"Most motorhomes and commercial transport vehicles come equipped with metal valve stems. If you do need metal valve stems, they are not expensive; a recent customer had 6 valve stems replaced on a 30’ gooseneck racing trailer for $36. They are available and can be quickly installed by any tire dealer."
So, I'm going to replace my rubber valve stems with metal ones ASAP, as I'm fully committed to keeping the TST TMPS on our AS. As an extra precaution I'll have them spin balance each wheel afterward, with valve stem sensors attached. (I can't cite a manufacturer as a source recommending that step, but it seems a reasonable thing to do.) Maybe someday we'll add Dynabeads, Counteracts, or Centramatics to help maintain better balance throughout the life of the tires.
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Old 04-05-2014, 04:30 PM   #58
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The inside rear wheels on the AI are steel and the outer rims are aluminum therefore requiring different construction as well as shape. A good set of metal stems for the AI run around $120 and IMHO worth every penny. As far as I am concerned the metal stems paid for themselves the first time I checked the air pressure after they were installed. As salon as I can find the URL for the source, I will post it. I tried some tire pressure monitors that replaced the valve stem caps, but they were rigged to make them difficult to steal and in turn difficult to remove to air the tires. They now occupy a cardboard box in my garage.
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Old 04-05-2014, 08:17 PM   #59
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DL1SPAL Chrome Dually Valve Kit

I posted the link to the proper metal valve stems for rear wheels on the AI back in post #14 of this thread. Here it is again.

DL1SPAL Chrome Duallyvalve Kit
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Old 04-06-2014, 06:04 AM   #60
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I am a fan of TPMS's. I am always in favor of more information.

But I am not a fan of unreliability - which many TPMS systems have. I've noticed that as time has gone on, the reliability of TPMS's has improved.
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Old 04-06-2014, 11:17 AM   #61
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I am a fan of TPMS's. I am always in favor of more information.

But I am not a fan of unreliability - which many TPMS systems have. I've noticed that as time has gone on, the reliability of TPMS's has improved.

If it doesn't spuriously alarm once in a while, you have to listen to country western music as you drive around the west just to stay awake. I'd rather have my TPMS scream at me.


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Old 04-06-2014, 03:15 PM   #62
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I tried some tire pressure monitors that replaced the valve stem caps, but they were rigged to make them difficult to steal and in turn difficult to remove to air the tires. They now occupy a cardboard box in my garage.
Did you consider the flow-thru version or do they have their own set of problems?
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Old 04-06-2014, 03:57 PM   #63
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I have the flow trough version and like it works well. I installed the metal valves and the dully extensions. Without the metal valve I had rapid pressure losses.
The only thing I noticed on the winter that I can have up to 20 psi difference and the alarm is set at 55 where I keep it at 61 usually. It goes back to the 61 if back to regular temperature by not driving. I see it moving from 50 up to 70 in the last year with it and about 15k miles.
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Old 04-06-2014, 04:11 PM   #64
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Did you consider the flow-thru version or do they have their own set of problems?
I asked a couple of places and they declined to opportunity to sell and install flow-thru monitors for the Sprinter 3500 because of the extended valve stems necessary to make the tires serviceable.
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Old 04-06-2014, 04:20 PM   #65
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The only one needed extension are the rear dully. The set extension cost $120 and carry a live time warranties. They can be bend easy and have a special rubber support for the inner tire.
I got them on for 15k and used them trough the winter it work great.
Most shops don't want to be bothered so you have to find a shop who wants to work with it as it takes some work to get them installed correctly.
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Old 04-06-2014, 04:44 PM   #66
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If it doesn't spuriously alarm once in a while, you have to listen to country western music as you drive around the west just to stay awake. I'd rather have my TPMS scream at me.


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Old 04-06-2014, 05:02 PM   #67
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You can always argue with the lady in your GPS.. Works for me
It wouldn't be a problem, she's wrong about half the time.
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Old 04-06-2014, 06:00 PM   #68
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I tried some tire pressure monitors that replaced the valve stem caps, but they were rigged to make them difficult to steal and in turn difficult to remove to air the tires. They now occupy a cardboard box in my garage.

Mine came with the antitheft lock gadgets - and for the reason you mention I decided not to bother with the locks.

I do remove the sensors (and also their batteries) when we are at home and the trailer is parked in a storage yard, but I reasoned that the chances of someone stealing the sensors when we are in an RV park, or when we stop for fuel or at a rest stop on the road would be pretty remote, and so it wasn't worth the bother of fooling with the locks.

Hopefully I won't live to regret the decision!

Brian.
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Old 04-07-2014, 05:55 AM   #69
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Sometimes even factory installed TPMS can be glitchy. Mine goes off when I receive a text message on my cellphone. Confirmed,with service techs.....go figure.
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Old 04-07-2014, 07:42 AM   #70
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I have been towing trailers of various types and sizes and have never had such a device installed on any of them in 40 years of towing. It's just another thing you think need if you are paranoid about such things. Last three flat trailer tires I had were due to rotten valve stems, and were discovered before embarking, or at destination. I have since had metal valve stems installed on most of my trailers. Wife's horse trailer is next.
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