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Open Roads Forum  >  Fifth-Wheels

 > Tire Pressure

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Nolan

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Posted: 04/09/12 11:11am Link  |  Print  |  Notify Moderator

Max. Plus check the pressure and the tires themselves every morning we are moving on to a different location.


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mapguy

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Posted: 04/09/12 02:06pm Link  |  Print  |  Notify Moderator

Trailer tires seem to hold up better long term with maximum sidewall pressure. Especially the ST class tires.

Two situations where less than max sidewall pressure is called for on a trailer

1. Excessive center tread wear -it must be consistent over all the tires though. In-consistent tread wear indicates other things....

2. Tires with excessive capacity -tires with capacity margins greater than ~20% usually show excessive center tread wear and need inflation reductions.

Never use the tire as a shock absorber (inflation reduction) install the proper devices like shock absorbers and or cushioned equalizers

azjeffh

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Posted: 04/09/12 06:19pm Link  |  Print  |  Notify Moderator

80 PSI.


Jeff
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luvglass

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Posted: 04/09/12 07:32pm Link  |  Print  |  Notify Moderator

E rated at 80#
G rated at 110#
H rated at 125#
All ratings should be at the maximum.


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SeniorGNC

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Posted: 04/09/12 08:55pm Link  |  Print  |  Notify Moderator

Michelin E load range LT's rated at 80 psi
Wheels rated at 75 psi
Therefore I inflate to 75 psi


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ExRocketScientist

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Posted: 04/10/12 05:26am Link  |  Print  |  Notify Moderator

mapguy wrote:

Trailer tires seem to hold up better long term with maximum sidewall pressure. Especially the ST class tires.

Two situations where less than max sidewall pressure is called for on a trailer

1. Excessive center tread wear -it must be consistent over all the tires though. In-consistent tread wear indicates other things....

2. Tires with excessive capacity -tires with capacity margins greater than ~20% usually show excessive center tread wear and need inflation reductions.

Never use the tire as a shock absorber (inflation reduction) install the proper devices like shock absorbers and or cushioned equalizers

I agree big time with that last statement. Solve the problem by going at the source -- the crudely designed suspension system. These days, we have solutions that run in the range of the cost of two tires. Without that solution, you just might have to buy three new tires because of blowouts from underinflation trying to solve the problem by reducing the air pressure.


ERS

diesel man 03

the north country

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Posted: 04/10/12 09:09am Link  |  Print  |  Notify Moderator

I go with the max on the side of the tire, think the engineer that designed the tire knows what he is talking about.

Brad NSW

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Posted: 04/10/12 08:25pm Link  |  Print  |  Notify Moderator

I go with the tire load chart the engineers developed, not the side wall MAX.

Here's why: Used to inflate my tires to 80psi, then got a TPMS. Here's what I saw. 80psi leaving San Diego at ambient temp of 55. Hit the desert by ElCentro and ambient temp was 110. TPMS said PSI was 110-115psi and I only drive 60MPH. No wonder I kept passing trailers w/blowouts. They'd passed me doing 70/75. Bet their pressures were over 120psi!

Now here is what I see with my TPMS. Leave SD inflated to 65psi (per chart below). Hit ElCentro and tire pressure is around 90psi. Trailer rides better and I don't have overinflated bombs on my trailer...makes me feel better. Highly recommend you giving it a try. My tires seem to be wearing better too.

For my Maxis 235/80R16E:
weight-psi
2270-40psi
2430-45psi
2600-50psi
2730-55psi
2870-60psi
3000-65psi
3130-70psi
3260-75psi
3420-80psi


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57 Panhead

Foothills of the Sierra Nevada

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Posted: 04/10/12 09:11pm Link  |  Print  |  Notify Moderator

I like to do what the tire maker says, this is from Goodyear's web site on RV ST tires:

Tire load inflation chart

Steve


Retired Teamster
2012 Jayco Eagle Superlite 31.5RLTS
07 F250 PowerStroke
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