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Old 07-05-2015, 03:52 PM   #15
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Ditto. Would like to use less in rear to improve ride but don't have the weight slips and the tire specs so will keep 61 psi.
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Old 07-05-2015, 05:48 PM   #16
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In prep for the arrival of my TPMS, Tire Minder A1A, on Tuesday, I was looking at the valve stems used on the wheels.

The front a metal and should do fine for mounting the sensor on the existing stem. However, the rear dually's leave a lot to be desired in my mind. The inner wheel has just a cheap plastic extender that is fairly short added to a flexible rubber valve stem. I can imagine the extender cracking in no time from the centrifugal force that the sensor will add - thus a flat inner tire.

Am I the only one who finds this a poor setup?
If I'm not alone, what have others found as the best solution?

Thinking of taking AI to a truck tire dealership and having metal stems installed.
I had a problem with my inners after I added extensions to them. They broke the factory plastic extensions and both inner tires lost all of their air pressure. I was very fortunate the tires did not come apart. Which is why I installed TPMS. http://www.airforums.com/forums/f240...te-131097.html
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Old 07-06-2015, 06:37 AM   #17
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I had a problem with my inners after I added extensions to them. They broke the factory plastic extensions and both inner tires lost all of their air pressure. I was very fortunate the tires did not come apart. Which is why I installed TPMS.
One of the first things I replaced on my Interstate was the plastic valve extensions with metal ones. The plastic ones leaked from day one.
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Old 07-07-2015, 12:58 PM   #18
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Just to be clear, are you saying that any stem on which a TPMS is to be installed should/must be metal and not just the inside of a dually?
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Old 07-07-2015, 01:38 PM   #19
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Just to be clear, are you saying that any stem on which a TPMS is to be installed should/must be metal and not just the inside of a dually?
I don't know that the stems must be metal but IMHO they should be. Although the TPMS sensors do not weigh much the additional stresses imposed at highway speeds can be significant. Personally I feel a lot safer with metal stems and think they are well worth the cost to purchase and have installed.
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Old 07-07-2015, 07:43 PM   #20
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Most all makers of TMPS sensors that you attach to the valve stems tell you to use metal valve stems. Lesson learned: Advanced RV installs a TPMS on all their Sprinter van conversions. The just used the stock rubber valve stems at first until a customer had a flat in front tire caused by failed valve stem. They now install only metal valve stems with the TPMS they install.


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Old 07-09-2015, 10:17 PM   #21
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I had the same. After installing the TPMS both of my rear inner tire would loose air. Of course the TPMS did let me know.
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Old 07-11-2015, 11:55 AM   #22
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Before spending the $120 I want to me sure they'll fit:

The AI dual rear wheels are steel rim on the inner and aluminum rim on the outer. These DKL1SPAL work for that - correct?

The straight long one goes on the inner wheel (currently a rubber stem)l, with the rubber grommet going in the aluminum outer wheel and the inner stem is threaded through the grommet - for extra strength.

The 135deg one is a replacement stem for the outer rim - but is a bit unnecessary. My outer rim already has a metal stem, allowing me to screw a 135 deg extension onto it. This simply replaces the two-piece outer stem with a one-piece. Correct?
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Old 07-11-2015, 01:59 PM   #23
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Titus - you are correct.


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Old 12-14-2015, 10:58 AM   #24
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(use a quality tire shop that will take the time to properly align the inner tire stems).
I have a 2016 Interstate Grand Tour Ext and believe the DL1SPAL is the one that fits my vehicle. I plan on ordering these and have the local tire shop (Gateway Tire) install these. I don't want to sound to dumb, but what is the proper alignment of the inner tire stems? They may know this, I just want to be able to tell them and also be able to visually see that they are installed correctly. I also plan to have all tire balanced, is this something most Interstate owners have done?

Thanks
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Old 12-14-2015, 01:42 PM   #25
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The inner extension comes straight out thru one of the "windows in the outer wheel. There's a rubber stabilizer that fits in the window and the extension comes thru the hole in it. There's really no alignment required.

Besides balancing, you should also get the front end aligned w/ the van loaded as close as possible to the normal travel weight. Have the camber set as close to zero as the specs allow. This may require the special camber bolt that MB sells.
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Old 12-14-2015, 02:38 PM   #26
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There's a rubber stabilizer that fits in the window and the extension comes thru the hole in it. There's really no alignment required.
That's a new one on me! My Interstate doesn't have any kind of rubber stabilizers that fit the slot in the outer wheels— never did. Any idea where I could buy some?
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Old 12-14-2015, 03:05 PM   #27
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The inner extension comes straight out thru one of the "windows in the outer wheel. There's a rubber stabilizer that fits in the window and the extension comes thru the hole in it. There's really no alignment required. Besides balancing, you should also get the front end aligned w/ the van loaded as close as possible to the normal travel weight. Have the camber set as close to zero as the specs allow. This may require the special camber bolt that MB sells.
Thanks appreciate the info.
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Old 12-14-2015, 03:49 PM   #28
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That's a new one on me! My Interstate doesn't have any kind of rubber stabilizers that fit the slot in the outer wheels— never did. Any idea where I could buy some?
They come with the DL1SPAL Dually Valve Kit. You can check with

yourtireshopsupply.com to see if they are available seperately. One thing to consider is that over the years Airstream used different wheels with different size/shape hand holes and the stabilizers are specific to the hole configuration.
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