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Old 08-17-2016, 08:29 PM   #29
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Yes. I'm half tHinking with the valve extensions, and ability to check and add air, may not need TPMS
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Old 08-17-2016, 08:44 PM   #30
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Yes. I'm half tHinking with the valve extensions, and ability to check and add air, may not need TPMS
Nothing wrong with half thinking. I'm a half-wit, so I half-think all the time!

The proof that I'm a half-wit is that I'm a smartass and a dumbass all at once, so that averages out as halfassed…
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Old 08-18-2016, 05:49 AM   #31
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I went with the ones in this link about two years ago and have had no problems. They are designed for Alcoa outer and OEM steel wheels like we have on our Interstates.
http://yourtireshopsupply.com/produc...-valve-dl1spal
If you are a member of Good Sam, I would recommend ordering these from them. They are about $35.00 less expensive. If you live near a Camping World they may have them in stock, but I would not recommend having them installed by Camping World.
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Old 08-18-2016, 09:01 AM   #32
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Nothing wrong with half thinking. I'm a half-wit, so I half-think all the time!

The proof that I'm a half-wit is that I'm a smartass and a dumbass all at once, so that averages out as halfassed…
I opened myself up to that one! ha
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Old 08-18-2016, 11:51 AM   #33
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Yes. I'm half tHinking with the valve extensions, and ability to check and add air, may not need TPMS

But TPMS will warn you of leaking tire, wheel or valve.
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Old 08-18-2016, 02:01 PM   #34
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But TPMS will warn you of leaking tire, wheel or valve.
But if you do decide to install TPMS on your duals, be advised that you'll first have to replace the rubber valve stems of the inner duals with metal ones. The extra weight of a valve-stem-mounted TPMS will actually damage the rubber valve stem as the tire rotates and cause the very leaks you're trying to detect.

Oh, and don't forget to TPMS your spare tire, too.
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Old 08-20-2016, 06:05 AM   #35
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So I'm going to get these, but have a few questions:

http://yourtireshopsupply.com/image/...it-dl1spal.jpg

1) I assume the long stems are for the inners, and the shorter, curved ones for the outers?
2) are there only 4 in a set? what about the front? do I buy another set and, if so, which stems would I use...I presume shorter, curved ones? (my vehicle isn't close by, so I'm not looking at the wheels right now)
3) what are those flat "trays" at the bottom of the photo?
4) how specific is the model number of these to the exact wheel I have? (again, don't know precisely because I'm not looking at the vehicle) OR are they pretty universal?

Thanks for any input. I"m going to have my MB dealer put them on, but he suggested I buy the exact ones I want and they'll install

Will probably get the TST tpms as well.

Thanks again for all the helpful info in this thread.
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Old 08-20-2016, 10:03 AM   #36
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1) I assume the long stems are for the inners, and the shorter, curved ones for the outers?

Yes correct.

2) are there only 4 in a set? what about the front? do I buy another set and, if so, which stems would I use...I presume shorter, curved ones? (my vehicle isn't close by, so I'm not looking at the wheels right now)

Only used on the rear axle as the front is easy accessible.

3) what are those flat "trays" at the bottom of the photo?

This will fill the cutout in the rim where the extension passes trough. It will support the long extension.

4) how specific is the model number of these to the exact wheel I have? (again, don't know precisely because I'm not looking at the vehicle) OR are they pretty universal?

I am not sure if there is any specifics but I have the same and they fit OK. You may have to bend them a little to make the TPMS to fit. They are bendable bit easy but they will bend without breaking.

You also need the rubber valves in the steel rims ( inner dually ) replaced with steel valves.
This is important as otherwise the rubber valves will leak slowly.

I would go to a tire place to get this installed as the have more experience then your Mercedes place.

I have them installed on my Interstate as well as on my Skydeck including my toad and they work real well.

Safe travels

Peter
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Old 08-20-2016, 10:44 AM   #37
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Standard "snap-in" rubber valves like TR413 are only rated 65 psi MAX. But they are cheap so are used many times.
There are some special "high pressure rubber valves" but bolt in are a better option.

Yes the large rubber "trays" are wheel specific as different brand (Ford, Chevy, MB etc) have different size "hand holes" the folks selling the valve should have the correct rubber supports for your vehicle.

One thing few people think about when using air chuck or pressure gauge is the stress they are placing on the tire valve rubber grommet (where valve goes through the wheel) and they just push hard with the gauge or air chuck.
You should ALWAYS support the valve stem with your hand when pressing on the stem. Only time you can get away with not supporting valve is with a short straight stem as you probably have on the front.

Bottom line if there is any bend in the valve stem support it and keep it from bending or moving when using air chuck or pressure gauge.
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Old 10-02-2017, 08:58 AM   #38
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Originally Posted by Tireman9 View Post
Standard "snap-in" rubber valves like TR413 are only rated 65 psi MAX. But they are cheap so are used many times.
There are some special "high pressure rubber valves" but bolt in are a better option.

Yes the large rubber "trays" are wheel specific as different brand (Ford, Chevy, MB etc) have different size "hand holes" the folks selling the valve should have the correct rubber supports for your vehicle.

One thing few people think about when using air chuck or pressure gauge is the stress they are placing on the tire valve rubber grommet (where valve goes through the wheel) and they just push hard with the gauge or air chuck.
You should ALWAYS support the valve stem with your hand when pressing on the stem. Only time you can get away with not supporting valve is with a short straight stem as you probably have on the front.

Bottom line if there is any bend in the valve stem support it and keep it from bending or moving when using air chuck or pressure gauge.

Thanks Tireman

Are you saying you need to add steel valves to the inner wheel WITH the dually valve ?

Do you recommend using the Duallyvalve. I noticed some on the forum do others say it will cause more stress then plastic valves
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Old 10-03-2017, 10:04 PM   #39
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Thanks Tireman

Are you saying you need to add steel valves to the inner wheel WITH the dually valve ?

Do you recommend using the Duallyvalve. I noticed some on the forum do others say it will cause more stress then plastic valves
Not 100% sure what you mean by "Duallyvalve".

I have 10 posts that cover valves on my RVTire blog. There are literally many hundred different valve configurations but basically I consider the valve the part that mounts in the hole in the wheel. Other pares such as metal and plastic extensions may screw onto the valve stem itself.

I recommend against rubber valves in any critical or high pressure application and prefer bolt in metal valves. These come in various lengths. There are some bolt in valves that are 4" to 7" long and some are bent to fit through the holes in the outer wheel to allow access.

Some RV companies are using extensions made of plastic and I am not comfortable with those extensions as they can be more easily damaged than metal valves.

Stainless steel braided hoses are an option for making access to adding air. Here is a post on the hoses on my motorhome (note picture was taken with the TPMS removed). The key with the hoses is proper tightening, supporting the mount when pressing an air gauge or air chuck on the end of the hose and having the outer end of the hose solidly mounted as you see in my picture.

Do you have a picture of the "duallyvalve" you are talking about? or maybe a link to the company selling that valve? Are these long stems what you are talking about?
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Old 10-04-2017, 08:17 AM   #40
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Originally Posted by Tireman9 View Post
Not 100% sure what you mean by "Duallyvalve".

I have 10 posts that cover valves on my RVTire blog. There are literally many hundred different valve configurations but basically I consider the valve the part that mounts in the hole in the wheel. Other pares such as metal and plastic extensions may screw onto the valve stem itself.

I recommend against rubber valves in any critical or high pressure application and prefer bolt in metal valves. These come in various lengths. There are some bolt in valves that are 4" to 7" long and some are bent to fit through the holes in the outer wheel to allow access.

Some RV companies are using extensions made of plastic and I am not comfortable with those extensions as they can be more easily damaged than metal valves.

Stainless steel braided hoses are an option for making access to adding air. Here is a post on the hoses on my motorhome (note picture was taken with the TPMS removed). The key with the hoses is proper tightening, supporting the mount when pressing an air gauge or air chuck on the end of the hose and having the outer end of the hose solidly mounted as you see in my picture.

Do you have a picture of the "duallyvalve" you are talking about? or maybe a link to the company selling that valve? Are these long stems what you are talking about?

Thanks Tireman. The link to the Duallyvalve kit is http://yourtireshopsupply.com/catego...printer-trucks
I have seen conflicting opinions whether to use or not to use
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Old 10-04-2017, 12:13 PM   #41
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Thanks Tireman

Are you saying you need to add steel valves to the inner wheel WITH the dually valve ?

Do you recommend using the Duallyvalve. I noticed some on the forum do others say it will cause more stress then plastic valves
I have over 50,000 trouble free miles with mine.
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Old 10-05-2017, 07:24 PM   #42
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Originally Posted by Marks71 View Post
So I'm going to get these, but have a few questions:

http://yourtireshopsupply.com/image/...it-dl1spal.jpg

1) I assume the long stems are for the inners, and the shorter, curved ones for the outers?
2) are there only 4 in a set? what about the front? do I buy another set and, if so, which stems would I use...I presume shorter, curved ones? (my vehicle isn't close by, so I'm not looking at the wheels right now)
3) what are those flat "trays" at the bottom of the photo?
4) how specific is the model number of these to the exact wheel I have? (again, don't know precisely because I'm not looking at the vehicle) OR are they pretty universal?

Thanks for any input. I"m going to have my MB dealer put them on, but he suggested I buy the exact ones I want and they'll install

Will probably get the TST tpms as well.

Thanks again for all the helpful info in this thread.


I’m in the process of replacing all 6 tires on my 2014.5 with Michelin Defenfer LTX M/S and have a chance to look at various valve extenders that is so much discussed for the inner dually, the ones with metal rims inside the pretty Durabrite Alcoa. I don’t know why people have trouble checking or airing them and had to resort to having any extension kits. Using a proper tire / air gauge, see attached, you don’t need any valve stem extension on any wheel, front or rear, outside or inside IF your outer rims are the Alcoa wheels with larger access holes (on virtually all NCV3 based newer AI). Yes I tested by reading the pressure and airing every one of them using this tire gauge. The metal valve stems can be just 1.5” long all around and this tool can easily reach them all. Click image for larger version

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You can save yourself some grief and it’s only $35, great built quality, precision and US made! I plan on buying the Tireminder with Bluetooth TPMS to screw on them short metal stems they should be plenty stiff for the centrifugal force the wheels generate at +70mph. I’m I missing something?
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