Goodyear Marathon Trailer Tires

I'm wondering.

Has everyone reached an understanding that you can't tell how a tire will perform by its weight? If not, what would it take to do so?

I’ll huff and I’ll puff until I blow your house in… :B

What is the difference in the weight of the beading, the cordage, the plies, and don’t forget the deeper tread??? How do each effect the performance???
The thing is you or I don’t know and GY isn’t going to tell you…
How does the added and unsprung weight effect the rest of the trailer???

So tires that have a disclaimer steer only, drive only are all inferior as well… what about directional tires are they inferior because of their disclaimer…

Actually the LTs are de-rated to 75 mph for trailer use… check even the mighty XPS rib speed rating…

To recap: your are taking a lot of assumptions that seem to make since to you and with no actual knowledge of the facts on the types of materials, or the mfg. processes used for the different types of tires to make your arguments…

You use as your example a tire size that very few travel trailers could ever use to make your arguments where they would have more meaning and be more appropriate in the 5er forums…
Most TT are light duty trailers defined as under a 10,000 GVW…

It doesn’t matter if the LT is a better tire when they don’t fit or exceed the axle ratings…

Here is a comparison :
both tires are 235 ( one is 80 = 80% and the other is 85 = 85% ) aspect ratio width to height .
Wheel diameter is 16 inch .
Readily available information :
From the tire rack website here is a comparison between ( nearly ) identical 235/80R16E tires :
From the tirerack website :
Goodyear ST 235/80 R 16 E
price = $ 135 each
weight = 34 # each
rated 3420 # at 80 psi on ST scale (weaker standard )
Goodyear LT 235/85 R 16 E
price = $ 157 each
weight = 50 # each
rated 3042 # at 80 psi on LT scale
So the Goodyear ST tire is placarded for 112.4 % higher load rating than the equivalent Goodyear LT tire .
And they will sell this ST tire for only 86 % of the LT tire .
And the ST tire has less mass for cordage , plys , caps and so forth
because it weighs 76 % of the Goodyear LT tire .
This is very telling as to how much lower the ST standards are in relation to the LT standards .
Further the ST tire has plainly stamped on the sidewall " for trailer use only " .
The LT tire has no disclaimer .
The LT tire is rated for 99 mph .
The cheaper ST tire is rated for 65 mph .
to recap : the manufacturer is the same.
both tires are 235 ( one is 80 = 80% and the other is 85 = 85% )
both tires are load range E or 80 PSI .
The ST tire is cheaper ( 86% cost ) .
The ST tire has less rubber and cords .
The ST tire weighs 76 % of the LT Tire .
The LT tire only gets a 3042# rating on the LT scale .
The cheaper / lighter ST tire gets a 3402 # rating on the less demanding ST scale .
This is very clear .
Goodyear , the manufacturer , has to build a much tougher tire for LT use such as on our heavy duty pickups .
The ST tire is UPRATED in sidewall weight rating due to the weak / cheap ST standard .
No way baby does the 34 # ST tire outperform the 50 # LT tire .
No way baby does the $ 135 ST tire outperform the $ 157 LT tire .
No way baby does the 65 mph tire outperform the 99 mph tire.
The ST scale is so weak that the placard on the side of equivalent size tires shows the ST tire at a higher weight rating than the similar sized LT tire .
even though the LT tire is plainly more tire from the same manufacturer.
The ST scale was installed to allow a much cheaper tire to be shipped from the RV factory as OEM .
This does not mean that we cannot upgrade our tires just like we do on our pickups .
As shown above :
The LT Tire definitely a more substantial tire than the same size ST tire .

Lowsuv wrote:
Francesca and MM49 ,
Can either of you disprove the fact that ST tires weigh less than LT tires from the same manufacturer , same size , and same load range ?

Can you tell us what and how many companies or manufacturer builds an ST and a LT tire in the same size and same load range and how about including the same load rating while you are at it???

Has you or anyone ever checked the testing and rating procedures for the European type tires and how they differ from the US???
I never heard of anyone doing that…

it’s pretty bad when the Chinese consumers are the ones complaining about quality, when they have a culture that has always defined quality as cheap… but they did in this case…

"Kumho used more recycled rubber than its internal standards, which may cause car accidents with tire rupturing.

Even though Lee Han-seop, the head of Kumho's China subsidiary, publicly apologized to Chinese consumers on a CCTV program Monday, many consumers still have deep distrust in Kumho, with some urging the prosecution to take legal action against all those involved in the tire-manufacturing process. “:B

the Kumho 857 has become popular with the Casita crowd but they report problems with them to including tread separation and blow outs…
Its hard to find European Commercial branded tires that are recommended for trailer use, or even mention trailers in all of their literature…

Information taken directly from the Continental tire website and catalog about the commercial Vanco tire line says… their words…

1 - “The growing demand for short-distance transport of passengers and goods
also leads to increased requirements so that the performance of modern day
((vans)) nears that of passenger car.”

2 - “The concept of the VancoTM Camper is to use long well-proven Vanco
technique, optimize its performance for distinguished ((motorcaravan))
requirements and thus ((cater to the needs of this specific target use)).”

3 - “The Continental Vanco Camper tyres are part of Continental’s Vanco tyre
range that comprises ((tyres exclusively for vans)).”

It sure seems they only talk about using them for VANS…

MM49 wrote:

Lowsuv wrote:
Francesca and MM49
Can you disprove the fact that within each same model and brand of tire that an E rated tire is always ( barring typos ) heavier than the C rated and P rated ?
Same manufacturer , same model .

You're mixing tire types and load ratings.
MM49

Nope .
Same manufacturer .
Same model .
Are you confused about tires ?

Don't mind me. I'm just looking around for a thread I seem to have misplaced around here somewhere........

Francesca and MM49
Can you disprove the fact that within each same model and brand of tire that an E rated tire is always ( barring typos ) heavier than the C rated and P rated ?
Same manufacturer , same model .

Lowsuv wrote:
MM49
you apparently did not read through the specifications .
The G26 225/70 R15 load range D is the heaviest duty tire readily available in a 15 inch size .
If you do the research you will discover your error .

I've read the specifications and made my choice. Load range E Maxxis ST 225/75-R15E tires. They are the correct choice for my 10,000 GVW TT.
MM49

gmw photos wrote:

I have in front of me, the owner manuals for both my Titan horse trailer and my LoadMax equipment trailer. Both state LT tire are approved.

Didn't look at the Loadmax manual, but according to page 15 of Titan User's Manual referred to above, P-rated tires are "approved", too, so long as they're load derated by 10%.

Since P-rated tires are subject to much more stringent testing requirements than are LT's- not to mention UTQG ratings, which LT's are excluded from- are they the better/best choice for the application? Of those three types "approved by Titan", I mean. Also noting that Titan doesn't use the word "approved" at all for any tire type- just gives instructions as to how to size them.