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  1. #1
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    New tires, what pressure do you run?

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    After nearly four years or rolling on the factory China bombs, I had some Goodyear Endurance ST tires installed.

    I had a good conversation with a buddy about tire pressures. I always ran my China bombs at max sidewall pressure, 80psi. He suggested running at the appropriate pressure for the load. I have never weighed my trailer but we went through the exercise anyway. My trailer max gross weight is 8500 pounds, with four tires that gives us 2125 pounds per tire (disregarding tongue weight). My tires are ST225/75R15.

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    50psi tire inflation gives me a capacity of 2150 pounds per tire...more than enough. I’ve probably never towed at max gross so that’s still pretty conservative.

    Running the tire pressure at closer to the recommended pressure should help the tires last longer and save some wear and tear on the camper. I’m going to tow at 50psi for my 1st trip of the season soon to see how it feels.

    What do you all do? Max pressure, or adjust for loading?
    Eric & Sandra
    2018 Grand Design Imagine 2670MK
    2000 Ford Excursion 7.3 Diesel 4x4

  2. #2
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    I air mine up to max cold PSI as stated on the tires.

  3. #3
    Seasoned Camper Cannon07's Avatar
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    Quote Originally Posted by RobWNY View Post
    I air mine up to max cold PSI as stated on the tires.
    Same here but I weight out about 16800
    2021 351MR
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    Rolling Along
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    Quote Originally Posted by RobWNY View Post
    I air mine up to max cold PSI as stated on the tires.
    We were not so fortunate...

    it was exactly 70 degrees outside the morning I set each tire to the 80 Psi max on our Solitude and ended up changing a blown tire on the freeway with a $1700 insurance claim! Out of desperation we bought an Eez-Tire system. I found that my trailer tires gain 25-35 Lbs while traveling, with the sun-side being 10 Psi higher than the shade-side. Tire temperature seems to have little difference. We now have Carlisle 15-ply Load Range "G" tires rated 110 Lbs. My 16 inch rims are also rated 110 Lbs max. We start out about 85 Psi and within an hour or so they are very near the 110 Psi max and stay that way until we stop.
    Frank and Char + Maya, Newport, Michigan. 2016 Solitude 379FL/2006 F250 6.0 diesel w/dually conversion. 4th rain-sense roof vent, two ceiling fans, Kodiak disc brakes, Carlisle G 14-ply tires, Water Miser x2, final dump valve, water header tank, fridge cond fan switch, outside range exhaust, elec hot water anode, filtered drinking water, triple battery box,

  5. #5
    Big Traveler Calbar's Avatar
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    Quote Originally Posted by fez111 View Post
    We were not so fortunate...

    it was exactly 70 degrees outside the morning I set each tire to the 80 Psi max on our Solitude and ended up changing a blown tire on the freeway with a $1700 insurance claim! Out of desperation we bought an Eez-Tire system. I found that my trailer tires gain 25-35 Lbs while traveling, with the sun-side being 10 Psi higher than the shade-side. Tire temperature seems to have little difference. We now have Carlisle 15-ply Load Range "G" tires rated 110 Lbs. My 16 inch rims are also rated 110 Lbs max. We start out about 85 Psi and within an hour or so they are very near the 110 Psi max and stay that way until we stop.
    No wonder you had a blow out. If your previous tire was rated for 110 PSI at cold tire temp and your only inflating to 80 PSI you are overloading your tire and will likely have the same problem with your Carlisle tires. The engineers for your tires and rims take into account the increase in pressure as the tire heats up and when they state 110 PSI cold tire pressure that's what they mean, not 80 PSI to heat up to 110 PSI. If you research cold tire pressure it means before your drive or after tires have sat for several hours to cool down.

    Here is the link from Bridgestone that you can read on how to properly inflate your tires so you can avoid another blowout with the new tires. https://www.bridgestonetire.com/trea...tire-pressure#

    Rob
    Last edited by Calbar; 04-05-2021 at 07:53 PM. Reason: Adding a link to cold tire pressure info
    Rob & Barb
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    Site Team Second Chance's Avatar
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    If they are the same load range as the OEM tires, they should be inflated to the pressure on the sticker on the side of the trailer.

    Curious, though - if you got four years of service out of your original tires, why do you refer to them as "bombs?"

    Rob
    U.S. Army Retired
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    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  7. #7
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    Quote Originally Posted by Second Chance View Post
    If they are the same load range as the OEM tires, they should be inflated to the pressure on the sticker on the side of the trailer.

    They are the same load range, and it is 80psi. Why would a tire manufacturer publish a load/inflation table if everyone just inflated to max sidewall pressure?

    Curious, though - if you got four years of service out of your original tires, why do you refer to them as "bombs?"

    I’m sure you’ve heard that term before. I personally feel safer towing my trailer with a better quality tire that doesn’t have the reputation of the Westlakes that came on the trailer.

    Rob
    Apparently I can’t just reply within your quote as the “message is too short”.
    Eric & Sandra
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    Site Sponsor NB Canada's Avatar
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    Quote Originally Posted by Second Chance View Post
    If they are the same load range as the OEM tires, they should be inflated to the pressure on the sticker on the side of the trailer.

    Curious, though - if you got four years of service out of your original tires, why do you refer to them as "bombs?"

    Rob
    My thoughts exactly

    Seems like the in thing to do I guess


    2021 Imagine 2400 BH
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  9. #9
    Big Traveler Calbar's Avatar
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    Quote Originally Posted by ArmyLifer View Post
    Click image for larger version. 

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    After nearly four years or rolling on the factory China bombs, I had some Goodyear Endurance ST tires installed.

    I had a good conversation with a buddy about tire pressures. I always ran my China bombs at max sidewall pressure, 80psi. He suggested running at the appropriate pressure for the load. I have never weighed my trailer but we went through the exercise anyway. My trailer max gross weight is 8500 pounds, with four tires that gives us 2125 pounds per tire (disregarding tongue weight). My tires are ST225/75R15.

    Click image for larger version. 

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    50psi tire inflation gives me a capacity of 2150 pounds per tire...more than enough. I’ve probably never towed at max gross so that’s still pretty conservative.

    Running the tire pressure at closer to the recommended pressure should help the tires last longer and save some wear and tear on the camper. I’m going to tow at 50psi for my 1st trip of the season soon to see how it feels.

    What do you all do? Max pressure, or adjust for loading?
    I run mine at the pressure listed on the trailer sticker. My GVWR is 9995 lbs and I have 3520 lbs per tire for a total of 14,080 lbs capacity. I run at 9500 lbs with some of that on the tongue. I much prefer the capacity margin and I have nearly 3 years and 24,000 km or 15,000 miles on my "China Bombs". I am a firm believer in running the tires with lots of spare capacity to keep them safe. I will be changing them out way before due to age than wear and if you are doing the same why chance the lower pressure?

    JMHO

    Rob
    Rob & Barb
    2022 Solitude 378MBS
    2022 RAM 3500 SRW HO Aisin 4x4
    Waterloo, Ontario, Canada

  10. #10
    Seasoned Camper Skilletface's Avatar
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    ArmyLifer, this subject brings out the best and worst opinions. I’ve ran those “Bombs” through some rough stuff for long time without ever being left on the side of the road (yet). Attached is a standard response that IMHO works.

    [COLOR="#FF0000"]Keep it simple. As long as everything is OEM, use the coach manufacturer nomenclatures or if tires have been changed to a different size use the tire manufacturers sidewall information maximum cold inflation as a starting point.
    Simple visual method:
    Get your unit axled out ( individual tire weight is best ) and adjust cargo inside if necessary, inflate your tires to manufacturers max cold inflation, take a short trip, observe how the tread face of the tire is contacting the ground it should appear lighter than the sidewall, make 2-5 psi adjustments down if required, until a nice even wear appears on the tread face.
    This is your rigs sweet spot, also you’ll be within + 5-10 psi. of what is published by your tire manufacturer inflation to weight tables.

    The Ultimate Tire Pressure Resource - TirePressure.com

    Example: My TT has 225/75 15 E max. cold psi. at 80 psi.. Loaded scaled GVW is 9440 lbs (includes tongue weight) divided by 4 = 2360 which means I can run tire pressure as low as 45 psi based on the tire manufacturers inflation to weight tables.
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    When this picture was taken I was at 60psi at 70 degrees. This is my sweet spot and able to deal temperature and elevation variations. It is suggested by many to increase the recommended tire to weight pressure by 5 - 10 %.
    As the abeyant temperature changes, your tire pressure will be effected by 1 psi for each 10 degrees up or down in temperature change.
    Tires have been engineered to withstand the increase in pressure as they heat up during transport.

    https://youtu.be/_eW2MfspLSQ All About RV’s Jared Gillis
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