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Old 12-07-2019, 11:56 AM   #41
CALinSC
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Not sure your point. I posted EXACTLY what GY tech Support told me to do if wanting to use the Tire weight/inflation charts instead of BLINDLY running MAX inflation.

This is for up sizing load range or if you have a RV that has PLENTY of tire capacity to run less than MAX.
I'm often misunderstood when posting about RV trailer tires. My information comes from government regulations and established tire industry standards.

RV trailer tires are any size and design the trailer manufacturer deems appropriate for that application.

RV trailer tires are governed by FMVSS (standards) and tire industry standards (ONLY!). FMCSA Regulations are not applicable with FMVSS.

So the inflation pressures found on the tire vehicle certification label are correct and minimum. Problem is, with RV trailers in the past there has hardly ever been any wiggle room as the vehicle manufacturers have fitted tires to your trailer with (sometimes) the very minimum required. Newer RV trailers will have a 10% increase in load capacity above the trailer's vehicle certified GAWRs.

The tire industry sticks by the vehicle manufacturer's original equipment tire load capacity. The do that with their canned statement found everywhere and goes like this. "Replacement tires MUST have a load capacity equal to or greater than the OE tires." Meaning by inflation.

Using replacement tires that do not conform to the OE tires load inflation chart are considered "plus sized tires." Once a new recommended tire inflation is determined for the plus sized tire it becomes the new minimum. The USTMA will allow any inflation pressures between recommended and tire sidewall max as OPTIONAL with the caveat, "Never use inflation pressures less than recommended minimum or what's on the vehicle certification label."

I can provide references if needed. They will be from FMVSS & USTMA.

Bridgestone/Firestone have a replacement tire PDF available on line that explains the procedures in much more depth and from the installers point of view. I don't keep such references once I have memorized the basics.
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Old 12-07-2019, 03:25 PM   #42
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It's good to finally get someone here that knows of which he speaks!!!!!!!!!!!THANKS

Bill
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Old 12-07-2019, 05:42 PM   #43
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Repeating a bunch of government CYA info is not the real world. For example a triple axle DRV sure as HE!! will never need MAX inflation and using the tire/weight inflation chart is wise for better ride, traction and tire wear.

Most RV's need MAX inflation because they are using the tire as a way to determine rated load.

But hey if someone wants to blindly run what the "LABLE" says have at it.
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Old 12-07-2019, 11:05 PM   #44
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Originally Posted by Cummins12V98 View Post
Repeating a bunch of government CYA info is not the real world. For example a triple axle DRV sure as HE!! will never need MAX inflation and using the tire/weight inflation chart is wise for better ride, traction and tire wear.

Most RV's need MAX inflation because they are using the tire as a way to determine rated load.

But hey if someone wants to blindly run what the "LABLE" says have at it.
Your arguments support zero load capacity reserves provided via inflation pressures.

RV trailer tires need those reserves so badly RVIA has mandated a 10% load capacity reserve for all RV trailers in production since mid 2016. Their inflation method differs from yours because yours is derived from FMCSA regulations and the RV trailer tire inflations are derived from FMVSS.
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Old 12-08-2019, 11:25 AM   #45
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They may say they need reserves but they are covering for the POS tires that most of these RV's come with.

Run QUALITY tires and you can load to MAX weight/inflation without concern. Ya don't think they have a reserve built into what the weight/inflation charts dictate?

I run quality GY tires, always have in all load ranges "E" to "H". I have had ONE tire separation from a bad batch over many thousands of miles without even a flat.

Some I had needed MAX and some I have used the charts. All with perfect tread wear.

Like I said if ya want to run what they say blindly go for it! I use my God given brain with support from GY Tech Support.
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