How much PSI are you running in your tires?

Discussion in 'Ask An Owner Operator' started by John Bertucci, Sep 16, 2020.

  1. staceydude

    staceydude Medium Load Member

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    I know this is an older post but those aircraft tires are split rims so we used a safety inflator system with a stand-off. The rim blowing apart is what really kills. When I was young, dumb, and full of .... we decided to just over-inflate a tube by itself in a tire safety cage and when it blew the entire hangar vibrated and people came from other ha gars because they thought it was a real explosion. Almost got into deep shizzle over it until we played it off as trying the show the newer guys how unsafe it was and blah blah blah lol.

    I am just like you, anything with higher PSI if it blows no matter what it won’t feel good. Checkout this vid, ain’t nothing to mess with.



     
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  3. Wespipes

    Wespipes Heavy Load Member

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    120 steer 105 drive 110 trailer
     
  4. rbrtwbstr

    rbrtwbstr Road Train Member

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    Our idiot parts changer in the shop insists 80 psi on the drives is enough. He says the tire salesman, the one who literally makes his money selling as many tires as possible, told him so. Think he might have an ulterior motive? We run 80-84k when loaded. I insist on 120 psi for the wear and fuel mileage.

    My question is how much fuel mileage loss does one suffer with under inflated tires?
     
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  5. jamespmack

    jamespmack Road Train Member

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    This should be fun. 95psi steer, 90 drives and trailers.
     
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  6. Jerry Rigs

    Jerry Rigs Light Load Member

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    110 steers, 100 drives. It's what the door sticker recommend.

    Fed Ex runs 85 in their trailers.
     
  7. blairandgretchen

    blairandgretchen Road Train Member

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    As little as I understand - the worst problems are caused by heat.

    Sidewall flex.
    Summer temps
    Higher speed.

    I never run recaps. I’ve never had one blow.
     
  8. staceydude

    staceydude Medium Load Member

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    Definitely, Michelin had a really good video out years ago on aircraft tires. Basically with every reduction in PSI
    Below recommended coupled with the weight of aircraft, caused a certain increase in tire temperature, the lower PSI caused the sidewall to flex, allowing the sidewall to break-down, increasing the temps allowing air between the plies resulting in a weakened sidewall eventually resulting in a blown tire. Basically the tire returns back to its original properties.

    I used to have the video as I used it at a Safety stand down in Mexico years ago. Same principal applies to any ties. Especially those with rigid sidewalls designed to carry weight.

     
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  9. Brettj3876

    Brettj3876 Road Train Member

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    Lately we've been running right around 100 on steers and 95ish on drives. Came down 10psi on steers and I can tell the difference. Rides better on these awesome NE roads
     
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  10. jamespmack

    jamespmack Road Train Member

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    Just remember, max psi is for max load. What about when your empty? I agree and understand max inflation psi is better for mileage. But not the best for wear or ride. Have to realize a tire is part of the suspension and effect ride quality. Find a happy medium. 110 cold inflation is way over max psi under a load on 100° day.


    I do what works for me. Just took Michelin energy of at a 150k miles with 13/32 still on tread. Only have one dropped tread area. Im giving credit to a monroe shock that didn't last 3 months. They are legal and would run out on a trailer a long time. But off my steers for age. They have 200k plus in them. Never been over 95 psi. I have been known to move some pounds too.
     
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  11. jason6541

    jason6541 Road Train Member

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    To be accurate you need the load and inflation table for your particular tires.
    Psi varies with weight. That is the actual correct answer.
    I run Michelin on all 5 axles 110 steers based on my weight I average on that axle
    100 on drives based on average weight I run
    Trl 100 lbs based on inflation table based on my average weight. No I do not adjust for heavier or lighter weights.
    But tires last and with Centramatics on all 5 axles and tire rotations every 100k
     
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