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125 PSI compressor for Cooper LRG tires on 378MBS - what do you use?

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  • 125 PSI compressor for Cooper LRG tires on 378MBS - what do you use?

    With the new tires needing 125 PSI and my small 2 gallon compressor not being able to inflate these I have been looking for a compressor to do this on the road and at home. It seems that unless I go big or to a 12V portable unit off of Amazon this is going to be a problem. Some that I have seen on Amazon have a max pressure of 150PSI and 12v which would be good but I am skeptical about 12v portable compressors. Some bad experience a number of years ago.

    So what is everyone else using to inflate these tires? Any recommendations?

    Thanks,
    Rob
    Rob & Barb
    2019 RAM 3500 Big Horn, 6.7 Cummins HO/Aisin
    2022 Solitude 378MBS (coming soon)
    2018 Reflection 297RSTS

  • #2
    I got the Porter Cable when I had to air my Sailuns. It goes to 150 psi. It stays home. Click image for larger version

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    Ted
    2021 Reflection 310RLS
    2020 F350 PS,CC,LB,SRW

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    • #3
      I use the Porter Cable compressor also. I believe Cate&Rob uses a Viair portable. The Viair 300P SXS will deliver up to 150 PSI.

      Jim
      The moderators for this site are not GDRV employees, but we do own GDRV products.

      Jim and Ginnie
      2017 Reflection 297RSTS

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      • #4
        Calbar -- perhaps my thought process may help? My criteria, search, and final result documented in two separate threads here: https://gdrvowners.com/towing-and-hi...ard-air-system and https://gdrvowners.com/forum/operati...uty-ada-system

        Rob's system is also mentioned in the first thread.
        Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

        2017 Ford F-350 DRW, '19 315RLTSPlus

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        • #5
          Calbar I have the pancake shown above, but in the truck I installed a Viair 150psi onboard unit above my running boards with the connection next to the rear license plate. They make a 200 psi version as well, if my tires were 125 I'd probably get that.
          Neil Citro
          2018 Reflection 28bh
          2019 F350 6.7L Long Bed Crew Cab

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          • #6
            I have a small hot dog craftsman oil style pump compressor max psi 135 that i picked up for $99 several years back. it fits nicely in the basement of the 5er.

            https://www.lowes.com/pd/PORTER-CABL...essor/50015924 if you can find one max pressure 135, lightweight.

            I also bought one of these several years back while working out of town to keep the tires up on the truck in the winter (had something in both fronts) https://www.campbellhausfeld.com/hom...ategory_id=309. you could bring up to whatever pressure you have, then top off with the portable inflator. I will admit, it's not fast, but it ran for about 1 hr every other week (30 min per tire) to keep them up. Went from 30 psi to 65 psi. You could also use it to air up one of those 2.5 gallon portable tanks to say 140 or 150 psi then use that to top off the tires. refill the tank as needed.
            Last edited by Jlawles2; 05-09-2022, 10:32 PM.
            Joseph
            Tow
            Vehicle: 2018 GMC K2500 Denali Diesel
            Coach: 303RLS Delivered March 5, 2021
            South of Houston Texas

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            • #7
              Calbar if you're into on board compressors, look at Air Zenith, ARB, or Viair. Air Zenith compressors push 4.25 CFM up to 200psi, ARB single is 2.34CFM and double is 4.68CFM. Viair has a bunch of different options from on board to protable.

              If you don't want to go portable, I think there have been several good suggestions.
              Momentum 21G

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              • #8
                Thanks TedS TucsonJim howson ncitro Jlawles2 and acoleman43 for all of the info. Lots to think about. I may try portable with my 2 gallon that goes to 125PSI just to get the last few PSI in and see how that all works. It really is just to make the few PSI adjustments just before the day's travel, or at least I hope so.

                I will let the group know what I decided and how it works.

                Rob
                Rob & Barb
                2019 RAM 3500 Big Horn, 6.7 Cummins HO/Aisin
                2022 Solitude 378MBS (coming soon)
                2018 Reflection 297RSTS

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                • #9
                  Visited with a friend who uses a Porta-Cable Pancake, 150-psi max pressure, to fill his tires to 125-psi. The compressor can fill the tire to about 121-psi before the resistance is greater than what the compressor can put out. After that he lets the compressor refill to 150-psi at which point the upper limit switch kicks it off, gives the tire a blast of air and the compressor pressure drops back down to about 125-psi, then he bleeds the compressor down to about 120-psi where the lower limit switch kicks the compressor back on, lets the compressor build back up to 150-psi and repeats. Says he ages about a year filling the 6 tires this way.

                  My friend also said that he is looking into an on-board compressor and air bags for his truck but has not really dug into this yet. He will be looking for something that can put out enough air and a high enough pressure to fill his tires, too.
                  John
                  2018 Momentum 395M
                  2018 Ram 3500 Dually
                  Every day is a Saturday, but with no lawn to mow.

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                  • #10
                    Originally posted by JBill9694 View Post
                    Visited with a friend who uses a Porta-Cable Pancake, 150-psi max pressure, to fill his tires to 125-psi. The compressor can fill the tire to about 121-psi before the resistance is greater than what the compressor can put out. After that he lets the compressor refill to 150-psi at which point the upper limit switch kicks it off, gives the tire a blast of air and the compressor pressure drops back down to about 125-psi, then he bleeds the compressor down to about 120-psi where the lower limit switch kicks the compressor back on, lets the compressor build back up to 150-psi and repeats. Says he ages about a year filling the 6 tires this way.

                    My friend also said that he is looking into an on-board compressor and air bags for his truck but has not really dug into this yet. He will be looking for something that can put out enough air and a high enough pressure to fill his tires, too.
                    I used to have this problem with a 100 psi compressor filling 80 psi tires. The lower limit switch did not come on until it dropped to 70 or 75, making it a chore. That is why I suggested a 200 psi compressor to the OP. I would not want to try and fill 125 PSI tires with a 150 PSI compressor.

                    I replaced my home one with this one from Lowes, 175 PSI 5 gallon and on wheels. Great for most everything I do at home, unfortunately not available anymore.

                    https://www.lowes.com/pd/Kobalt-5-Ga...essor/50081562
                    Neil Citro
                    2018 Reflection 28bh
                    2019 F350 6.7L Long Bed Crew Cab

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                    • #11
                      Thanks JBill9694 and ncitro . Very good advice. Was thinking about the lower limit switch in some of my searches as it doesn't do any good trying to fill a tire to 125 psi if the lower limit switch is below that.

                      Rob
                      Rob & Barb
                      2019 RAM 3500 Big Horn, 6.7 Cummins HO/Aisin
                      2022 Solitude 378MBS (coming soon)
                      2018 Reflection 297RSTS

                      Comment


                      • #12
                        Originally posted by JBill9694 View Post
                        Visited with a friend who uses a Porta-Cable Pancake, 150-psi max pressure, to fill his tires to 125-psi. The compressor can fill the tire to about 121-psi before the resistance is greater than what the compressor can put out. After that he lets the compressor refill to 150-psi at which point the upper limit switch kicks it off, gives the tire a blast of air and the compressor pressure drops back down to about 125-psi, then he bleeds the compressor down to about 120-psi where the lower limit switch kicks the compressor back on, lets the compressor build back up to 150-psi and repeats. Says he ages about a year filling the 6 tires this way.

                        My friend also said that he is looking into an on-board compressor and air bags for his truck but has not really dug into this yet. He will be looking for something that can put out enough air and a high enough pressure to fill his tires, too.
                        Tell your friend Air zenith is rated at 200 PSI (100% duty cycle), ARB is rated at 150 PSI (I believe...and 100% duty cycle) and Viair has compressors up to 200 PSI. THe 485C is a 200 PSI compressor with 100% duty cycle.

                        Air Zenith is the best performer as far as CMF.

                        Air Zenith is 12v only. ARB has 12V and 24V models. VIair does have some 24V models as well.
                        Momentum 21G

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                        • #13
                          Calbar I use the Viair 450P-RV and it works like a champ handling the high psi that the Coopers under my Solitude 310GK require.
                          Brandon & Krysten
                          2022 Grand Design Solitude 310GK-R
                          2019 GMC Denali HD 4x4 Duramax L5P, B&W Companion Slider

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