Forum Discussion

Hemling's avatar
Hemling
Explorer
Jul 12, 2020

Tires

I've got about 10,000 miles on my original 'D' rated trailer tires. On a -10,000 lb. 37' TT. I've always followed the 10% rule on my truck tires - inflate cold to 90% of max PSI to allow for heating on the road while towing. I like to run my trailer tires a little lower though - I put them about 45 psi (65 max) because I feel like it cushions the rough roads a bit better. I might be leaving a little MPG on the table with higher rolling resistance, but does anyone else do this? Or am I full of it. Should I just max all my pressures out and say to he!! with it?
  • jdc1's avatar
    jdc1
    Explorer II
    Jul 12, 2020
    What you should do is dump those "D" rated tires and get a set of "E"'s. Run them up to 70psi and not worry about anything.
  • Hemling's avatar
    Hemling
    Explorer
    Jul 12, 2020
    That's the plan. They're wearing out fast so not too long.
  • guidry's avatar
    guidry
    Explorer
    Jul 12, 2020
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.
  • 8ntw8tn's avatar
    8ntw8tn
    Explorer
    Jul 12, 2020
    guidry wrote:
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.


    X2. There's a website, rvtiresafety.net, by Roger Marble, a retired tire engineer. He explains things much better than I'm able, but comes to the conclusions offered above.
  • agesilaus's avatar
    agesilaus
    Explorer III
    Jul 12, 2020
    I dropped the ST junk tires and switched to light truck tires.
  • 2112's avatar
    2112
    Explorer II
    Jul 12, 2020
    I use to inflate my load D rated tires to the 65psi max. But then I upgraded from D to E. The CAT scale says I have 7460lb load on my 4 tires. I ride slightly nose high, so the rear pair may carry a little more burden. According to my tires load/inflation table below, I should be inflating mine to 45psi. The max is 80psi. I have found 65lbs on the E tires a nice, smooth ride.

  • Cummins12V98's avatar
    Cummins12V98
    Explorer III
    Jul 12, 2020
    guidry wrote:
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.


    BAD advice!
  • Latner's avatar
    Latner
    Nomad
    Jul 12, 2020
    Cummins12V98 wrote:
    guidry wrote:
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.


    BAD advice!


    Please explain. I have run max psi on three different trailers, all of them with "china bombs" and have not had one blowout or even a flat. Lucky I guess?
  • JIMNLIN's avatar
    JIMNLIN
    Explorer III
    Jul 13, 2020
    guidry wrote:
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.

    Great advise for many reasons rvtiresafety....tire experts.....rv blogs on tires.... talks about.
    Like Michelin says;
    max performance...
    and max reliability...
    comes at max pressures.

    Now if the trailer was over tired severally then max pressures aren't needed.
  • Cummins12V98's avatar
    Cummins12V98
    Explorer III
    Jul 13, 2020
    Latner wrote:
    Cummins12V98 wrote:
    guidry wrote:
    Definitely upgrade the load rating tires and always inflate to max PSI. That rating allows for heat. Under and over inflation leads to tire failure.


    BAD advice!


    Please explain. I have run max psi on three different trailers, all of them with "china bombs" and have not had one blowout or even a flat. Lucky I guess?


    Going up in load range per GY Tech use load inflation chart and add 5psi.

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