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  1. #1
    Member Jeff Hahn's Avatar
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    Air pressure in small trailer tires

    I needed a new set of 4.80 X 12 tires for my Lund trailer. So, I called the local guy that I buy tires from and he put them on this morning. The maximum pressure is listed on the side as 90 psi. I asked if he put 90 pounds in them., He said "Yes," but then went on to say that if my trailer "bounces" he would suggest lowering the pressure to 55-60 pounds. I asked him what he meant by "bounce." And, he said that when the trailer hits a bump in the road, does it bounce or does it bang pretty hard. My trailer does "bounce" in the sense that it really seems to "bang" hard when I hit a pot hole. So, he suggested lowing the tire pressure to soften the ride. I told him how sensitive the Marathons on my Ranger trailer are and that they'd over-heat and wear prematurely unless they are kept at 50 psi. He agreed, but said that the tire he installed are load rated far beyond the weight on my boat/trailer, so running 55-60 pounds would not create a problem. This guy has sold tire his whole life and I have bought lots and lots of tires from him. So, I have no reason to doubt his expertise. But, I thought I'd see what all of you thought.
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  3. Electrical/Wiring/Trolling Motors Moderator CatFan's Avatar
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    #2
    Lowering the pressure helps with reducing a springy ride for a lightly loaded trailer. I'd run at max unless the trailer is bouncing excessively.

  4. Member haveme1's Avatar
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    #3
    Isn't 90 the beed setting pressure not what to run all the time ?
    I know the trailer tires have tougher sides and they make up for no shocks by being springy. 14" run 50-60 lbs max.

    Here is a sale page that has the load range and air pressure settings
    http://www.easternmarine.com/12-and-...iler-Tire-Rim/
    Last edited by haveme1; 06-23-2012 at 01:05 PM.
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  5. Member
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    #4
    I would run the air pressure that the mfg. suggests. I think running a tire with less air pressure than it calls for is asking for tire trouble.

  6. Member Nova Kaw 650's Avatar
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    #5
    Try an experiment: put 90lbs in one tire and 50 in the other. Drive the loaded trailer for 5-10 miles at highway speeds. Stop and compare the tires for heat. If the 50lbs is warm but not hot, it's okay. If it's getting hot, add more air.
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  7. Member haveme1's Avatar
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    #6
    Here is a sale page that has the load range and air pressure settings
    http://www.easternmarine.com/12-and-...iler-Tire-Rim/
    *******
    "Just For Today", Life is kinda hard but it's
    better than the other options .. er ..option !