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Hemling

Montello, WI

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Posted: 07/11/20 09:13pm Link  |  Quote  |  Print  |  Notify Moderator

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

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Posted: 07/11/20 09:30pm Link  |  Quote  |  Print  |  Notify Moderator

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

Montello, WI

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Posted: 07/11/20 09:47pm Link  |  Quote  |  Print  |  Notify Moderator

That's the plan. They're wearing out fast so not too long.

guidry

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Posted: 07/12/20 05:44am Link  |  Quote  |  Print  |  Notify Moderator

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

Southeast Iowa & Texas Hill Country

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Posted: 07/12/20 06:39am Link  |  Quote  |  Print  |  Notify Moderator

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.


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agesilaus

North Florida

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Posted: 07/12/20 09:54am Link  |  Quote  |  Print  |  Notify Moderator

I dropped the ST junk tires and switched to light truck tires.


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2112

Texas

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Posted: 07/12/20 09:55am Link  |  Quote  |  Print  |  Notify Moderator

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.

[image]


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Cummins12V98

on the road

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Posted: 07/12/20 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

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!


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Latner

Indiana

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Posted: 07/12/20 05:47pm Link  |  Quote  |  Print  |  Notify Moderator

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

Oklahoma

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Posted: 07/13/20 05:29am Link  |  Quote  |  Print  |  Notify Moderator

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.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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