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Old 10-15-2018, 10:52 PM   #1
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Valve stem extenders...I WON'T EVER USE THEM AGAIN!

Yesterday I was driving 75mph on I70 when TPMS went off showing rapid pressure loss on inner passenger rear tire. I was able to pull over and stop within about 1/2 mile or less at a safe location. I never felt a shudder, or any change in drivability. If TPMS hadn't alarmed I would have kept driving until the tire shredded and caused serious damage to the rear fiberglass, wheel well flare, or who knows what (been there done that). Thank you EEZTire TPMS system! Just a few hundred dollars cost for EEZTire, saved me a lot of cost for tire and damage to coach, and possibly more.

When I got out and checked the tire I found this valve stem extender pictured here broken in two pieces and jammed between the rims (inner and outer) and all the air out of the tire. I called GoodSam roadside and they were going to dispatch but it could be a long time due to my remote location and Sunday evening and $87.50 to replace valve stem. I told them I would call back in a minute and decided to look and check further. I removed this valve extender that had broken in two and the inner valve stem and schrader valve were Intact! I hooked up my 50ft air pressure hose to my air outlet on my coach and pumped up the tire (which had no visible damage whatsoever and an intact bead but virtually no pressure). After inflation, It held 105psi (my usual pressure) and I was able to drive home 2 more hours. Now I just need to have that tire inspected or replaced (because I'm not sure if it was damaged). Externally it appears new. I just don't know if it got any internal sidewall damage. Anyone experienced this? Did you need to replace the tire? Tire is 22.5in Michelin only 9 mo old (8k miles). BTW when talking with the roadside assistance tech they said "We do not recommend anyone use valve stem extenders, they constantly fail". I for one will never use valve stem extenders on my inner wheels again. Very scary and potentially costly. I just slid part way under the coach on my back and filled at the internal valve stem, no big deal. By the way, I had just topped off air in tires the day before and valve stem looked ok.
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Old 10-15-2018, 11:45 PM   #2
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I’m of the option that breakage like that could have happened even on the primary valve stem. I’m glad it worked out well for you compared to what could have been the outcome.
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Old 10-15-2018, 11:51 PM   #3
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I did away with valve stem extenders after having several problems over the years.
Vince and Susan
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Old 10-15-2018, 11:55 PM   #4
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I had the same issues with valve extenders that screw onto the tire valve stem but didn't have TPMS so of course I lost a tire. I installed the Borg valve stems and ran them for 6 years with no problems. Will never use a screw on extender again.
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Old 10-16-2018, 01:27 AM   #5
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Have the valve stems replaced with the steel extra long one for the inner wheel and then you won't have that issue. But for me, for now I have the braided hose extensions on mine and have had no issue.
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Old 10-16-2018, 03:20 AM   #6
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Well, I’m glad your situation worked out OK, but your roadside tech is flat wrong. Valve extenders don’t “constantly fail”, they sometimes fail, like most mechanical contrivances.
I had long braided SS flexible extenders installed on my inners six and a half years ago when I bought my new Michelins. The outer ends are attached by small brackets to the large center hub. No problems at all.
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Old 10-16-2018, 05:04 AM   #7
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Borg Dully system is worth the investment for the product, installation cost and peace of mind.
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Old 10-16-2018, 05:42 AM   #8
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It appears that you had "non-pressurized" rigid extenders and I am glad that I didn't fall for that idea. Have used flexible, braided extenders for years with no problems. As others have said, they are held under the lug nuts by SS brackets and are extremely durable. even have TPMS sensors on them and they are nicely tied down.
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Old 10-16-2018, 05:44 AM   #9
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I have the stainless steel braided hose type extenders on my Dually Ford truck and have had zero issues with them for 1 1/2 years. When I replace the tires though, I may go with the one piece steel valve stems.
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Old 10-16-2018, 06:18 AM   #10
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On second thought, what is most interesting is that the extender that you had installed was specifically advertised to eliminate the possibility of losing air pressure from an extender failure. Strange...isn't it. Would love to know how that failed.
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Old 10-16-2018, 06:18 AM   #11
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Airless extenders are another option. The idea of an airless valve extender is that if something goes wrong with the extender then you don't lose air from the tire.

I've had them on for a year now with no issues.

I was posting at the same time as Scott. I don't think the HE-372 extender shown is airless. The description of it is: Truck Extension Short Collar 3/8" - Lightweight - 3 15/16".

I think a valve - TPM - airless extender combo could work.

I don't think a valve - airless extender - TPM combo would work though. It would probably be too heavy on the end of the extender and also keep the extender fully pressurized making it NOT airless.
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Old 10-16-2018, 06:21 AM   #12
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Originally Posted by RV2traveler View Post
Airless extenders are another option. The idea of an airless valve extender is that if something goes wrong with the extender then you don't lose air from the tire....
From the picture, it appears to be an airless extender, which will be totally defeated by a TPMS sensor since it will permanently depress the Schrader valve when installed...and make it a conventional extender.
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Old 10-16-2018, 06:42 AM   #13
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We have been looking for a solution to the rear duals for years now. We had tried the braided extenders a few decades ago and were very unhappy with them. Have they improved? Can anyone recommend a brand, style or whatever? We are ready to try them again and when looking the prices are all over the place.

We do have a TPMS system on all tires.

Sue and Tom

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Old 10-16-2018, 06:48 AM   #14
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75 mph and a valve stem extender is the problem...
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