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What trailer tire pressure?

Discussion in 'RD's Lounge' started by Wbinder, Jun 13, 2019.

  1. Wbinder

    Wbinder Well-Known Member

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    This subject drives me nuts but I’ll ask on here specifically for my setup. Tandem axle trailer with a runner bottom on it. 5 ply tread radial trailer tires with Max cold temp of 65 psi. I don’t want to run the max obviously but I don’t want to run to low and cause the tire to over heat and have a blow out as it’s a 6 and a half hour tow to the river for us. I also hate seeing the boat bounce all over the place and I’m starting to find a new stress crack after every trip from towing. Sooooo what’s the suggested pressure. As far as my truck it’s a stock f150 and I’ve got the trailer perfectly level whole towing


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  2. Bpracing1127

    Bpracing1127 Well-Known Member

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    I run mine 5 Psi below max
     
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  3. Wizard29

    Wizard29 Really a 34 Eliminator

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    Max PSI as shown on the sidewall for trailer tires.
     
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  4. Big B Hova

    Big B Hova HOSS

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    I run 55psi in mine. 5lbs below max. Same with toy hauler.
     
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  5. Havaduner

    Havaduner Never home on weekends

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    I generally run all my tires 10% below max.
     
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  6. JDub24

    JDub24 American Bad-Ass!!

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    Depends on what the tires maximum weight limit is. For example if the tire is rated for 3k pounds and your boat and trailer weigh 1800 then no need to run them at max.
     
  7. pronstar

    pronstar President, Dallas Chapter

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    I always ran my trailers at max sidewall. psi. But my trailers were always very heavy.

    It also depends on the tires you’re running.

    And remember, a tire’s load and speed ratings are at max sidewall psi. Lower the psi, and you reduce the rating

    A car or LT tire has a ton of excess capacity, and high speed ratings. Much safer to fiddle with psi.

    And ST tire, I’d run at max psi because there’s not a lot of excess capacity for tires designed to go 65mph.


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  8. Singleton

    Singleton Well-Known Member

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    I set mine 5lbs below max.
     
  9. Albert

    Albert Well-Known Member

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    I set mine 5.5 lbs under max
     
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  10. DaveH

    DaveH Well-Known Member

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    for me it boils down to the weather and how far I am going.

    towing across the desert in 110' and a long tow....you would be SHOCKED how much your tires build pressure. any time I stop I put my hand on the tire.....looking to see if it is anything more then "mildly" warm...….they should not be HOT.

    I have had blow outs from lightly loaded trailer tires in extreme heat. cold weather I simply set the tire with a few PSI of the max rating.
     
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  11. milkmoney

    milkmoney Well-Known Member

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    I let my people take care of that issue ...I just fly in and go boating

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  12. waterhorse

    waterhorse Well-Known Member

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    I go with the pressure marked on the tire. Also, is the boat strapped down to the trailer? Boats can easily bounce up off the trailer and slam back down on the bunks during the rebound. This could be causing some of the stress cracks.
    edit: I have started carrying a laser temp gun so I can easily see if a particular tire or bearing hub is hotter than the others. FYI
     
  13. 185EZ

    185EZ Well-Known Member

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    Max psi for trailer tires and check your date code
    trailer tires don't have a long life
    and when they die it isn't pretty
     
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  14. pwerwagn

    pwerwagn Inmate #4800

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    Pump em up till they pop, then back em back down by 7psi...
     
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  15. $hot

    $hot Well-Known Member

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  16. Flying_Lavey

    Flying_Lavey Dreaming of the lake

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    Trailer tires always go to max PSI. Due to their construction and carrying loads, reducing pressure really doesn't help but it can hurt. When I was working at a tire shop, ALL trailer tires went to max PSI. No matter the application or load at that moment.

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  17. TexasJet

    TexasJet Well-Known Member

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    5psi below max when cold. If you inflate to the max when cold you will be running over max when hot. Could be as much a 5 psi over. I'm on my 5th trip out here from Texas pulling a boat and that is what I do. So far, no failures.
     
  18. Wizard29

    Wizard29 Really a 34 Eliminator

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    The max pressure shown on the sidewall is the cold pressure. That number accounts for the fact the tire will heat up and build pressure while running.
     
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  19. Racey

    Racey Maxwell Smart-Ass

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    I can't believe how many people run below max rating, The max pressure rating has a safety factor built in, that's why it's called "COLD PSI",

    The lower you run the pressure the hotter the tire gets, the more load on everything, just like riding a bicycle. They aren't gonna blow from being over-inflated if you fill to the max rated pressure.
     
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  20. Yellowboat

    Yellowboat Well-Known Member

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    If it says 65, I run 65. Or at least 65 on my gauge
     
  21. Bpracing1127

    Bpracing1127 Well-Known Member

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    Yes this, I only run 5 psi below due to I’m not sure how accurate my 19$ gauge is lol, but yes they should be filled all the way up (cold) even with a empty trailer.
     
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  22. LHC Kirby

    LHC Kirby LifeTime Member

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    I run 5 psi below as well - seem common in this post..... I understand your post, but in the heat of summer driving across the desert.... (I don't) I think it's a good idea..... otherwise pressure could get too high.

    FYI - I really like the idea of the chalk test, I'll try that on my vehicles and trailer tires :)
     
  23. MohavValley

    MohavValley Well-Known Member

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    If you want to get detailed, your tires will have a psi vs load chart that tell you how much to inflate them to for your load.

    Here is some good info on RV tires
    http://www.yournexttire.com/trailer-load-inflation-chart/

    Also running tires at Max psi can cause them to separate more often and faster. It's best to adjust tire pressure based on specif tire and load being carried. I had some 35 nittos that I bubbled the caps on 5 of them running the max psi. Dropped the psi when not necessary to carry the load and no problems. On the flip side I run 265/75/16 LT load E (10 ply) on 07 Toyota 4 runner and run them at 40-45 psi and they work awesome last forever and ride good.
     
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  24. 77charger

    77charger Well-Known Member

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    Mine are car tires got my 207 boat is light enough for them but max pressure is 44 pounds so I run them there. Just went to river last weekend and noticed 2 of the tires are 7 years old tge other 2 were bought 2 years later so 5 years on those. Oh last set lasted 7 years.

    My toyhauler i run at 65 psi no issues there.
     
  25. Sharp Shooter

    Sharp Shooter The "anti-yuppie"

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    Some air compressor tire inflators don't show accurate pressure.

    tire inflator.jpg

    I use a stand alone guage for air.

    Autometer tire.jpg
     
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  26. River Runnin

    River Runnin Well-Known Member

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    With a man boat, you must take it to the MAX! :D ...Just like the straps! ;)
     
  27. CoolCruzin

    CoolCruzin Well-Known Member

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    I run 46 psi
    Trailer tires tandem axel
     
  28. pronstar

    pronstar President, Dallas Chapter

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    If only tire companies tested at temperature extremes like the Arctic winter or summertime in Death Valley.

    Oh, wait...


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  29. crzy2bealive

    crzy2bealive Well-Known Member

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    5 below cold max

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  30. Flying_Lavey

    Flying_Lavey Dreaming of the lake

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    That's the case with car and truck tires. Not as much as with Trailer tires. Loads can fluctuate greatly along with suspension that is barely engineered at all leads to a VERY different application for the tires. Hence why it is recommended to run trailer tires right at the max PSI rating.

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  31. warlock250

    warlock250 Well-Known Member

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    Old timer once told me go 10 psi over recommended a d you will be fine. So I always do Max psi and I tow at speed limits on trailer tires. Trailer tires are not DOT regulated a d they are run at a 65 mph 2 hour test run. Passenger car tires are run at 80 mph for 8 hours I think. So I always put Lt truck tires on my trailer if possible.

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  32. warpt71

    warpt71 punk ass kid

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    I think I ran my trailer tires on my flat at like 30lbs. Now that may have been a stupid decision on my part but I didnt have a blow out ever. Ill check the tires when I get to the river this weekend and see what they are rated for, I know they are 14 " "Towmaster"'s and they have gpt to be over 10 years old lol
     
  33. ToMorrow44

    ToMorrow44 27 Advantage TCM 800efi

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    How heavy is the boat and what is the weight rating for each tire? I run passenger car tires so I run them at Max for the weight rating. If you’re not pushing the weight on each tire, you can get away with 5psi below max, but that’s about as low as I would go.
     
  34. ToMorrow44

    ToMorrow44 27 Advantage TCM 800efi

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    A buddy ran 2 sets of E-load Nittos on his Tundra towing a 28’ boat. Both sets started to separate under 30k miles. Its not from running near max psi, that’s a BS cop out answer for Nitto not warrantying them. I think Nitto had some quality control issues as I’ve read of lots of other people having similar issues. My F250 is only used for towing so the rears are always inflated near max, I’ve never had a tire separate (not Nittos).
     
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  35. milkmoney

    milkmoney Well-Known Member

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    I thought you were an idiot

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  36. warlock250

    warlock250 Well-Known Member

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    Once I was and still occasionally.

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  37. Waterjunky

    Waterjunky Well-Known Member

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    Dealing with trailer tires right now. I run fully at the sidewall number. As stated before, they are designed to be ran at that number, not lower. The are designed to heat up some and thereby "overinflate" as they warm up. This is all normal. At the same time, I am fully aware of just how junky most trailer tires are. One of the ways I am dealing with this is on my tandem axle junk trailer I ordered tires for this morning, I jumped up a rating over what I needed. Total package weight would be probably 4500 lbs at the max. I ended up spending just a couple of dollars more and jumped clear up to D rated meaning I could technically carry the entire load on the hitch and two tires. This should run them cooler and have less stress meaning I should have fewer issues. Being just a junk trailer and not used on major trips and such I am hoping this gamble works and the cheap tires I bought hold up. The boat and when I buy a 5er to replace the cabover will get premium along with staying well below the max weight rating. Intended use makes a difference, I don't want issues on long trips and vacations. local is easier to deal with and more likely to get spotted at frequent stops.
     

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