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Old 07-25-2016, 11:51 AM   #11
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I upgraded the tires on my forest river surveyor today went to e load but could not find max rim pressure on rim. Went on line and it's 60 psi and the maxxis are good for 65 psi so I guess I will have too run them at 60 max. any thoughts on this ,I know that tires get a lot time here.
We ran 80 psi lr Es with lr C 60 psi rims when we upgraded the tires on the old trailer from C to E and went years with no issues. We didn't ever have another flat or even a pressure leaking issue for years after the change. I sure would not worry about 65 lbs on a 60 psi rated rim.
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Old 07-25-2016, 04:52 PM   #12
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Question for Tireman9

On cars and trucks, there is a specified tire pressure based on (I assume) the weight and handling of the vehicle. Why is it different for a trailer tire? It seems if you upgrade the load rating on your trailer and up the pressure, it would ride rough and be hard on the trailer.
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Old 07-25-2016, 08:08 PM   #13
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Originally Posted by mnoland30 View Post
On cars and trucks, there is a specified tire pressure based on (I assume) the weight and handling of the vehicle. Why is it different for a trailer tire? It seems if you upgrade the load rating on your trailer and up the pressure, it would ride rough and be hard on the trailer.

Tire inflation pressures are not arbitrary, they are set by vehicle manufacturers as described - in part - in this reference and others referenced within this one.

https://www.gpo.gov/fdsys/pkg/CFR-20...sec571-110.xml
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Old 07-25-2016, 08:50 PM   #14
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All that information must mean something to the fed. O'Reily asks simple questions and never gets an answer. Same with that.

FR sent our trailer with spare rim rated for 2150 lbs. with D range tires rated for 2450 lbs. I believe and I'm looking at E range Maxxis.

"At this point in time, what difference does it make?"
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Old 07-26-2016, 10:11 AM   #15
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All that information must mean something to the fed. O'Reily asks simple questions and never gets an answer. Same with that.

FR sent our trailer with spare rim rated for 2150 lbs. with D range tires rated for 2450 lbs. I believe and I'm looking at E range Maxxis.

"At this point in time, what difference does it make?"
What it boils down to is your perception of safety. I'm surprised your would contemplate using tires with a maximum 80 PSI rating on rims with 65 psi rating.

Why did you not return the spare tire/rim assembly to FR?

Tire manufacturers must provide a list of acceptable rims to be used on every tire they make. They must provide access of such lists to the public. All tire retailers have such listings for the tires they carry/sell.

Vehicle manufacturers are required to make tire/rim fitments that are appropriate, meaning the OE fitments meet minimum standards for the vehicle they are fitted to.

When making selections for replacement tires other than those the size of the OE tires, an owner really needs to consult with tire retailers that are fully trained in the procedures that follow tire industry standards for such fitments.

If you are so dissatisfied with the OE tires that came on your unit why would you use your replacements on rims that are not earmarked for the tires you want to use?
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Old 07-26-2016, 10:37 AM   #16
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I honestly believe there is some confusion here. I think folks are mixing max tire pressure with max rim pressure. I have never heard of a trailer rim limited to 65 psi, with that said I may be wrong as often happens. I promise not to get offended if someone tells me I'm full of well you know.
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Old 07-26-2016, 11:02 AM   #17
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I honestly believe there is some confusion here. I think folks are mixing max tire pressure with max rim pressure. I have never heard of a trailer rim limited to 65 psi, with that said I may be wrong as often happens. I promise not to get offended if someone tells me I'm full of well you know.
Reference from a popular rim OEM provider.

T02 | Sendel Wheels
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Old 07-26-2016, 11:13 AM   #18
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holly molly batman enough said
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Old 07-27-2016, 10:58 AM   #19
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Originally Posted by mnoland30 View Post
On cars and trucks, there is a specified tire pressure based on (I assume) the weight and handling of the vehicle. Why is it different for a trailer tire? It seems if you upgrade the load rating on your trailer and up the pressure, it would ride rough and be hard on the trailer.
Trailers are run at or above the tire max load capacity almost all the rime while cars almost never are.
The Interply Shear comes from the fact that trailer tires are dragged around all corners while cars and TV are not. This increases the force trying to tear the tire apart by about 24%
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Old 07-27-2016, 11:03 AM   #20
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All that information must mean something to the fed. O'Reily asks simple questions and never gets an answer. Same with that.

FR sent our trailer with spare rim rated for 2150 lbs. with D range tires rated for 2450 lbs. I believe and I'm looking at E range Maxxis.

"At this point in time, what difference does it make?"
Rim should be returned to FR for replacement. Also a complaint filed with NHTSA for FR providing potentially unsafe wheel for the application.

Good for you for making the effort to learn what the ratings are on the parts FR gave you.
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