Tire pressure?

Discussion in 'Tires / Brakes / Bearings / Axles' started by lkc, Apr 18, 2018.

  1. lkc

    lkc Active Member

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    Jun 5, 2017
    Colorado
    Hello all--next question.

    I have Carlisle 5.30-12's tires on my NTM pup---previous owner said he purchased new tires beginning spring/summer of 2017--they do look new--I still need to look for the date of the tires' manufacture

    1. How does the date of manufacture read on the tire?
    2. Tire inflation---from what I can see on the side of the tire it says "at max 80 P.S.I cold"??
    Is that 80 PSI Max correct??? The tires on my truck only take 35-40 PSI.
    Or are these trailer tires more like a more heavy duty truck/trailer/tractor tire??

    80 PSI seems awfully high

    Thanks for any info!
     
  2. joet

    joet Well-Known Member

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    Date coeds are week and year, 0118= Jan. 2018. 5217= Dec. 2017
    Run whatever the tire says on the sidewall. Running a tire under inflated will cause the tire to run hot
     
    Last edited: Apr 18, 2018
  3. giadiep

    giadiep Active Member

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    Yes 80 psi is correct. I believe the date code is 4 digits, but agree with @joet with WWYY. So if it reads 2018, it means 20th week of 2018.
     
    Fbird likes this.
  4. tombiasi

    tombiasi Well-Known Member

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    Northwestern New Jersey
    You already got your answer but I am just curious. Does it actually read "max" or does it give a weight limit at 80psi.?
     
  5. tenttrailer

    tenttrailer Art & Joyce - Columbus, O

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    Thornville, OH
    It should read something like "Max Load" 80 PSI. It indicates that when the tire is at max load you need 80 PSI cold inflation. But to be on the safe side running them at that Max Load number "80 PSI" is a safe bet. Running tires hot or at to greater speeds will greatly reduce the life or we could say increase age. They will run extra hot if overloaded or under inflated. Some tire manufactures have tire load to PSI tables for their tires.
     
  6. lkc

    lkc Active Member

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    Colorado
    Tombiasis--it says Load Range C "45 LBS (475 KG) at 80 P.S.I. cold"
     
    DJS12354 likes this.
  7. xxxapache

    xxxapache Well-Known Member

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    I have three trailers with three different size tires. I run the sidewall printed max on them all...I have 4.30 x 12 on one. It calls for 90 psi.
     
    Last edited: Apr 19, 2018
  8. lkc

    lkc Active Member

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    Colorado
    Oops--sorry, misprint---it says "1045 LBS (475 KG) at 80 P.S.I. cold" Load Range C
     
  9. tombiasi

    tombiasi Well-Known Member

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    That's how they are usually marked. It's telling you the maximum load at rated psi. It does not say 80 psi Max and they should be inflated to 80 psi.
     
  10. lkc

    lkc Active Member

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    Jun 5, 2017
    Colorado
    --Thank you
     
  11. chambo

    chambo Active Member

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    Southern California
    I've always read that you should inflate to whatever the trailer sticker says, not the sidewall. You should have something on the driver side or tongue that lists weights, ideal tire pressure, torque, etc. My trailer tires have the same "80 psi" on the sidewall, but the manufacture sticker says to inflate to 50 psi.
     
  12. tombiasi

    tombiasi Well-Known Member

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    Northwestern New Jersey
    The trailer manufacturer only know the tire it came with not the tires you have now. If you inflate an 80 psi tire to 50 psi you are looking for trouble.
     
    PointyCamper and xxxapache like this.
  13. Fbird

    Fbird Active Member

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    Ferndale MI
    if you now the exact weight on each tire you could go to manufacturers website for the tire, they should have a chart that shows what pressure for a given weight. the safest is to fill the tire to the max, it will help keep the tire from overheating and minimize uv damage.
     
    xxxapache likes this.

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