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dedmiston's avatar
dedmiston
Moderator
Feb 29, 2016

How to inflate dually tires?

I have what feels like a dumb question. I just bought a new (to me) 2014 RAM 3500 diesel dually and I don't see anything in the manual about inflating the tires.

How do I inflate the inner tires? I haven't had time to crawl under and look for it, but I don't see the valve stem. Does it have a normal cap like the rest of the tires? How do you reach the cap without losing it?

Why are the valve stems on the outer tires turned in? They're less accessible for my inflator & gauge.

I've been using this inflator with a built in gauge for years on my truck and trailer tires, but it doesn't look like I'll be able to use it with the rear dually tires anymore.
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  • blt2ski's avatar
    blt2ski
    Moderator
    Feb 29, 2016
    dedmiston wrote:
    Thanks everyone.

    I found THIS on Amazon and it looks like it fits my inflator.

    I'll get under there when I get home tonight and figure out where the inside stems are.


    "THEY" should be on the opposite side as the outer ones. I do have to admit, my 05 dualy, one was in the middle of the holes. Not likely to get to that one!

    But the picture of the amazon filler is the best one IMHO to get. Sometimes the inner is angled like the outer one. Unless you have LARGE holes in the rims, you many times can not get that style to work. You can also find pressure guages with the same head shape, that are 15-18" long or there abouts. Around $30-40, but I have had three of them for over 20 years, still showing the same pressures against other ones as they did back then.

    Marty
  • the_bear_II's avatar
    the_bear_II
    Explorer
    Feb 29, 2016
    I've started going to tire shops to have the tires inflated or pressure checked. Most do it for free and I give them a $10 tip..."buy some lunch or drinks for the crew".

    It's worth $10 to save me from having to do it.
  • dedmiston's avatar
    dedmiston
    Moderator
    Feb 29, 2016
    Thanks everyone.

    I found THIS on Amazon and it looks like it fits my inflator.

    I'll get under there when I get home tonight and figure out where the inside stems are.
  • blt2ski's avatar
    blt2ski
    Moderator
    Feb 29, 2016
    For the inner dual, you may need a straight head filler, or at least from my experience owning multiple dullies, it is easier to do the inner this way. The outer needs an angled rear facing part of the dual head mentioned.

    Pretty normal really.

    Not sure I would do an extension. But from how I used my truck(s), that would be a mess in and of themselves. But with that in mind, I know a number of folks that like them.......... Choose your poison and deal with ea issue to your liking.

    Marty
  • Sam_Spade's avatar
    Sam_Spade
    Explorer
    Feb 29, 2016
    You can also have valve stem extensions installed.

    And yes I know that they have their own set of problems and considerations.
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Feb 29, 2016
    Double check to see which offset double-headed gauge you need. There are two angles and one may not work as well, or at all, as the other.
  • fj12ryder's avatar
    fj12ryder
    Explorer III
    Feb 29, 2016
    So if you mount that tire anywhere else the valve stem will be pointing the right direction for you to get at. Those wheels can be mounted at any position.
  • dedmiston's avatar
    dedmiston
    Moderator
    Feb 29, 2016
    donn0128 wrote:
    Buy a double headed tire gage and inflator nozzle. Reach through the hole in the outer dual. At least thats what I do.


    Thanks Donn. Any idea why the outer valve stem points back to the inside of the wheel?
  • donn0128's avatar
    donn0128
    Explorer II
    Feb 29, 2016
    Buy a double headed tire gage and inflator nozzle. Reach through the hole in the outer dual. At least thats what I do.

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