Upgrade Hispec to Endurance= 110psi to 80psi ???

[Jethrone]

I have a Yukon 2022 399ML and want to upgrade our tires. Currently have 235/80R16 @ 110PSI.

When I look at Endurance for same size it shows a lower load range and (obviously) lower psi with corresponding lower load.

Even if I moved up to a 235/85R16 it is still showing max 80psi.

Am I missing something???
I plan on going into the store to discuss but thought there might be some expertise here.

[dsol]

They have an older chart that shows the 235/85 had various load ranges that exceed 80 PSI.

At 80 PSI it shows 3,640, at 95PSI it shows 3,960 and at 110PSI it shows 4,400. However I am seeing this chart in a few trailer forums but not on current Goodyear website. If you Google the Goodyear Endurance load range chart you will find it.

In my research these tires had the highest load rating at 80 PSI. There were higher ratings at higher PSI but I prefer 80 with my rims as they are stock and the stock China bombs (Westlake's) that came on the trailer were rated for 80 PSI and I really didn't want to run higher than that. My feeling is that any component that comes on these trailers from the factory is the cheapest quality stuff out there so I don't want to push my luck.

I have a two axle TH (Dutchmen 3305) and while there are bigger and heavier trailers out there, I don't think any have two axles like mine. IMO this trailer probably should have come from the factory with 3 axles and thus less load capacity per tire (and leaf springs, shackle, etc.--but hat is another story.) but I trusted the manufacturer and didn't know then what I know now.

Anyway, back on the subject, I would be surprised if these Endurance tires at 80PSI didn't have sufficient capacity compared to the OEM tires, although if current tires call for 110PSI then I could be wrong.

[franktafl]

Look at cooper Roadmaster tires. Mine pump up to 125# and have an absolutely wonderful warranty and are regrooveable.

[Tireman9]

#1 The tires must be rated to deliver the load sufficient to support 110% of GAWR per RVIA guidelines.


If the tires you are looking at do not meet that requirement then you have to find tires that will deliver that load capacity.




What SIZE and Load Range is listed on your Certification Label?

[Ckparker2013]

Why on earth would you want to go with a lower load range tire? Check and see if Goodyear has an equal or higher load range, to meet your requirements, in the Endurance line.

[leisuresolar@gmail.com]

Tireman is a pre tire guy. Trust what he says. There are a couple of pro's on here, find them and trust them.

[Jethrone]

Ok, well I finally figured out the problem I was having in the process. For some reason I was not thinking of the ply. 10/14/16 ply. Not sure why it wasn’t registering but sorted now. So now I will have to look at Carlisle/now Carlstar in order to meet the load rating.

[Tireman9]

Originally Posted by Jethrone

Ok, well I finally figured out the problem I was having in the process. For some reason I was not thinking of the ply. 10/14/16 ply. Not sure why it wasn’t registering but sorted now. So now I will have to look at Carlisle/now Carlstar in order to meet the load rating.

Ya "Ply" started to go away in the late 1960's when stronger Nylon went into Bias Ply tires and we were making "6 for 8 Ply" tires. With the "Truth in labeling" movement and the switch to Radial construction in the 70's "Ply Rating" went away officially to be replaced with "Load Range". Which uses a Letter rating C, D, E etc



However many people in the RV community insist on using the term "Ply" without including the word "Rating" so sometimes they can confuse themselves.



Almost all Radial tires have a single (one) body ply. Tire engineers use increased strength cord for the body "ply" as there are some industry standard tests to measure the "strength" of a tire. The DOT testing has a series of tests with ever increasing levels of "force" required to break or rupture the body of a tire.


If you bother to read the material list molded on the sidewall of all tires you will see that most ST type tires and LT type tires have just one layer or ply of Polyester in the sidewall. For Load range C, D, and E tires you will also see two layer of Steel. There are some tires that also have 1 or 2 layers of Nylon on top of the steel belts. There are some tires that use materials other than Polyester for the body cord.
In general moving to larger size tires in 19.5", 22.5" sizes and Load Ranges such as F, G, H etc you will see the sidewalls will be 1 Ply or layer of steel and the belts will be 3, 4 or even 5 layers of steel.


No matter the number of layers or the materials used all Load Range E tires must pass the same "strength" level.


You also need to know that the "Strength" test is not directly related to a tires load capacity, as Load capacity is based on the air volume and the inflation level and only the inflation level is relative to the strength level measured in the DOT testing.


See none of this is simple and that is why there are "Tire design Engineers" who spend their careers learning, developing and designing tires to meed the needs of our customers and the goals of the tire companies.