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Old 06-27-2015, 08:54 PM   #1
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Tire/wheel question

Purchased our Presidio about 6 weeks ago. Each time I checked the tire pressure I found the right rear inner was down on air. At first it would be down a little, but over time it got a lot worse so Friday I took the coach to the local tire shop and they pulled the wheel tire off. What they found was a lose valve stem. The packing nut was lose enought to tighten with my fingers! Ugh

So while doing this, they oberseved by 4" vavle extentions that I added to my inners. The extentions protrude through the hole in the outer wheel and make it a lot easier to add/check air. The owner suggested I purchase rubber inserts to go in these ports in the outer wheel that also have a small hole the extention will pass through and support the valve extention. He shared the added weight and lenght of the extention would add stress on the valve once centrifical force went to work.

Anyone know what these are callled?

Would like to add my TPS, but this sounds like a good idea before I add even more weight.


2008 Thor Mandalay Presidio, 400 ISL
RVing since 1974!
Lots of Motorcycles
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Old 06-27-2015, 09:28 PM   #2
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Seems to be different names for the inserts. You need to know the brand and size of the wheels, and the opening shape and size needed, as there are several different types.

Kent & Sue & Pecos
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Old 06-27-2015, 10:23 PM   #3
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LLoyd, I guess they're technically called "Valve Stem Extension Stabilizers" and can be purchased in a variety of sizes and shapes to fit your specific application.

I'm surprised that your wheels don't already have them. Do you have a Freightliner chassis with aluminum wheels? If so, many FCCC coaches that have aluminum wheels have a hole pattern that would use a rubber stabilizer in the shape like the one in the image attached below ...but many motorhomes use wheels with round or oblong holes too and they make the valve stem extension stabilizers in a variety of sizes and shapes to fit those holes.

If you go to this link, you can see just how many sizes are available: CLICK HERE

I take mine off each time I clean the wheels and clean them separately once they are off. I then just pop them back on.
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Old 06-27-2015, 10:29 PM   #4
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I believe these wheel parts are called "valve stabilizers". The buytruckwheels.com website does not show an illustration of this part but does list a "Valve Stabilizer/Extension Kit" for Alcoa 22.5x9 wheels with 1.5 inch handhole diameter.
My coach does not have the circular handhole wheels but rather the more triangular handholes and I do have the rubber stabilizers. If you are on a Freightliner chassis you may be able to obtain them from FCCC, Gaffney, South Carolina. The Gaffney techs found mine stuffed between the duals! They highly recommended and installed them.
Hope this helps.
Fred & Mary RVM135
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Old 06-28-2015, 01:09 AM   #5
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Lloyd....It's a little late now, but might be worth the effort and piece of mind. They make long metal valve stems for the inner dual, so no extension is needed. Many run out and by the Dually brand and pay some astronomical price. Most tire dealers carry the longer metal stem. I bought some for my Diplomat a few years ago. They were $11.00 each. They're also available on line. They still need the stabilizer, but you eliminate a connection that can be problematic.
Don & Mary
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Old 06-28-2015, 04:09 AM   #6
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Thanks everyone, Yes Freightliner, and I have the oval holes in my wheels. Will look and see the brand today.

Thanks again!


2008 Thor Mandalay Presidio, 400 ISL
RVing since 1974!
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