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Old 11-11-2020, 07:07 PM   #1
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Newbie tire stem question

Hi, everyone, I've searched the forums, and not seen this mentioned, so either it's a really strange thing, or it's something so obvious that nobody needs to discuss it. Anyway....

I have a class C on a Ford E450 chassis. It has dual rear wheels. The tire stems on the rear tires are a larger than the front. Is there some kind of adapter so that I can use a tire inflator on these, or do I need a special inflator/pressure gauge, or is there some other solution? I am also trying to find a TPMS that could fit the back. I tried one from Amazon, but have the same problem -- the caps fit the front tires, but not the back.

I appreciate any and all advice on this!!

Best wishes,
Shannon
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Old 11-11-2020, 07:30 PM   #2
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There is a large bore valve stem, but I have never seen them on light truck tires.

They are used on off road construction equipment.

If you do have them, there is an adaptor to convert them to standard size.Click image for larger version

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Old 11-11-2020, 07:49 PM   #3
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Twinboat, thank you so much!! I will check these out. I have been really worried about this!
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Old 11-12-2020, 09:35 AM   #4
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I don’t think I have ever seen the large bore stems on a on road vehicle just on tractors and heavy off-road equipment.
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Old 11-12-2020, 09:51 AM   #5
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Originally Posted by twinboat View Post
There is a large bore valve stem, but I have never seen them on light truck tires.

They are used on off road construction equipment.

If you do have them, there is an adaptor to convert them to standard size.Attachment 307700
I'd rather not have to use the adaptors. Couldn't a person just have the tires dismounted and the right valve stems installed?
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Old 11-12-2020, 10:17 AM   #6
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I'd rather not have to use the adaptors. Couldn't a person just have the tires dismounted and the right valve stems installed?
Not sure, specs say the large bore stems fit a larger hole then standard ones.

13/16th" compared to 5/8th"
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Old 11-18-2020, 04:36 PM   #7
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Fluti314, we have a class C on a Ford E-450. We bought our valve stems online and had Goodyear Commercial tire dealer install them since each rim had to be removed to install the valve stems. We ordered SKU# DL1FCFR. Our Tire (TPMS) monitors work great with the TPMS receiver on the dashboard. https://yourtireshopsupply.com/categ...lly-valve-kits
Good Luck
Marge
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Old 11-20-2020, 05:30 PM   #8
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Quick update - joke's on me

I ordered those stem adapters. After checking with O'Reilly's and Advance Auto (neither of which had ever heard of them), I wen to Amazon and bit the bullet for them.

When they came, they didn't fit -- WAY too big. As I sat next to my RV, trying to figure out what to do, I was fiddling with the stem cap, and wouldn't you know, the cap twisted off -- and underneath was a regular sized stem!

Here's a picture, for anyone who's interested. The one that was on there already is some sort of adapter, not simply a cap, because it has a little ball end that lets out air when you press on it.

SO -- all's well that ends well. Even though I got the wrong part, I would NEVER have even figured this out without all of your advice; thank you so much!!
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Old 11-20-2020, 08:44 PM   #9
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Looks like it was some type of extension for easier access since the end of the stem is right at the hub.
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Old 11-20-2020, 08:45 PM   #10
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Quote:
Originally Posted by Fluti314 View Post
I ordered those stem adapters. After checking with O'Reilly's and Advance Auto (neither of which had ever heard of them), I wen to Amazon and bit the bullet for them.

When they came, they didn't fit -- WAY too big. As I sat next to my RV, trying to figure out what to do, I was fiddling with the stem cap, and wouldn't you know, the cap twisted off -- and underneath was a regular sized stem!

Here's a picture, for anyone who's interested. The one that was on there already is some sort of adapter, not simply a cap, because it has a little ball end that lets out air when you press on it.

SO -- all's well that ends well. Even though I got the wrong part, I would NEVER have even figured this out without all of your advice; thank you so much!!


They look like Alligator V2b double seal caps that let you check/adjust pressure without removing. Very convenient
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Old 01-01-2021, 12:56 PM   #11
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Quote:
Originally Posted by Rush2 View Post
Fluti314, we have a class C on a Ford E-450. We bought our valve stems online and had Goodyear Commercial tire dealer install them since each rim had to be removed to install the valve stems. We ordered SKU# DL1FCFR. Our Tire (TPMS) monitors work great with the TPMS receiver on the dashboard. https://yourtireshopsupply.com/categ...lly-valve-kits
Good Luck
Marge
Ditto this. I had Borg stems from this company installed on my inner duals. They are excellent quality and the customer service is excellent. Give them a call and they will walk you through exactly what you need.
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Old 01-02-2021, 02:47 PM   #12
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Originally Posted by coachmanjay View Post
They look like Alligator V2b double seal caps that let you check/adjust pressure without removing. Very convenient
Winner, winner, chicken dinner!!!!!!!! I had them on my Winnebago View and they worked great. Service thru the cap, no need to remove them. Those are not threads on there, they are grip grooves for some tire servicing tools that have grooves on the inside, to make them stay on better.

Charles
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