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Old 07-18-2017, 01:14 PM   #1
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Gye - Goodyear endurance

I was perusing the available 2018 Airstreams in the model I want and in one picture I saw Good Year Endurance.
Is that what the factory is supplying today? Was that a special order? I know the GYE is available in both D and E rating, but I couldn't tell from a generic picture what it was.

Now I'm more confused. I just looked up speed ratings and the charts indicate that a D rated tire is only good to 40 mph. E rating is good to 43mph. Is this possible?
N rated tires good to 87 mph.

Am I mixing load ratings with speed ratings? The charts don't seem to do load rating in A-Z.
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Old 07-18-2017, 01:25 PM   #2
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Here is an existing thread on the GYE ST tires FYI:

http://www.airforums.com/forums/f438...sa-157249.html

They are discussed here too:

http://www.airforums.com/forums/f438...es-161583.html
http://www.airforums.com/forums/f438...15-156339.html
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Old 07-18-2017, 01:27 PM   #3
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I believe that the Endurance is replacing the Marathon as Goodyear's ST offering. I don't know if there is any real difference other than the name.

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Old 07-18-2017, 01:29 PM   #4
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The threads I just linked go into detail on the differences, including that the new GYE are made in the USA not China.
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Old 07-18-2017, 02:03 PM   #5
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Quote:
Originally Posted by OTRA15 View Post
The threads I just linked go into detail on the differences, including that the new GYE are made in the USA not China.
Thanks, I've read so many tire threads I swore I'd never look at another until I entered the quandary of Speed rating vs. Load rating.
Unfortunately, the images of tires want you to see how pretty they are and not show the sidewall information.
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Okay, I've gleaned that the tire has both a speed and load rating, but not necessarily shown on the sidewall.
You can have load range E and speed range E.
Passenger car tires are marked differently than trailer tires.
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Old 07-18-2017, 02:18 PM   #6
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The original question was:
Is Airstream shipping new 2018's with Good Year Endurance?
And if so, are they load rated D or E?

I'm sorry I mentioned speed rating, but I recall someone saying the GYM are only rated for 65 MPH, and I think they meant D rated tires are only rated for 65 KPH which is true but does not apply to GYM.

But I always learn something.
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Old 07-18-2017, 02:32 PM   #7
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Most trailer tires are rated to 65 mph. The new goodyears may be different.
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Old 07-18-2017, 03:06 PM   #8
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Quote:
Originally Posted by Mollysdad View Post
I was perusing the available 2018 Airstreams in the model I want and in one picture I saw Good Year Endurance.
Is that what the factory is supplying today? Was that a special order? I know the GYE is available in both D and E rating, but I couldn't tell from a generic picture what it was.

Now I'm more confused. I just looked up speed ratings and the charts indicate that a D rated tire is only good to 40 mph. E rating is good to 43mph. Is this possible?
N rated tires good to 87 mph.

Am I mixing load ratings with speed ratings? The charts don't seem to do load rating in A-Z.
Yes, you are mixing speed ratings with load ratings.

Light Truck (LT) and Special Trailer (ST) tires are specified with a load range that is a letter like D or E. The letter designates the max air pressure the tire allows, and weight-carrying capacity is directly related to pressure.

Passenger car tires are not given these letter ratings. They are classified as either "Standard Load" or "Extra Load".

There is also a letter designation for speed rating that is separate from the other letter rating.

So for example, one version of the Goodyear Endurance is specified as "ST225/75R15 117/112N E". So it is a load range E tire (max pressure 80 pounds) with a load rating of 117 (2833 pounds) (or 112 if you are installing it as a dual) with a speed rating of N (87 MPH).
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Old 07-18-2017, 03:39 PM   #9
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I am struggling with the same question and Colonial told me the new trailers all have Endurance but didn't know what pressure to inflate them to.
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Old 07-18-2017, 08:15 PM   #10
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Got hammered in Forks WA and long story short, we decided to upgrade to Endurance on the road. No dealers had any Marathons much less Endurance but a lucky call to a large commercial company owned shop turned up 5. This is the kind of place where mining dump trucks get their tires so it was with some interest when we pulled up in the industrial park.

They printed out spec sheets from Goodyear computers on what came off and what we put on.

Replaced with Endurance ST225/75R15 material# 00231946 product code #1503102
Service code 117N with the N meaning 75mph rating
Load Range E
The trailer tire and rim combo won't take metal stems but we installed high pressure brass ones all around.
Kept the spare as it was.

Learned that the 65psi marking on the side of the trailer refers to absolute max and should be inflated cold at 60.

The new tires go to 80 max and they inflated at 70 suggesting this was right. If we needed more load capacity we could go higher psi but not needed for 25FB.
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Old 07-18-2017, 09:23 PM   #11
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Picked up our 2018 Serenity 27FB last week and it did come with the Endurance tires. They were standard equipment and were not a special order.
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Old 07-19-2017, 04:54 AM   #12
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Mollysdad-

We installed the Endurance tires on our Pete, a '14 Flying Cloud 27fb twin in early summer, in Load Range E, 80 psi max pressure. We are very impressed with the tire, as was our 30+ year Goodyear dealer, who sells 100 or more ST tires a month (we're in farm country here, lots of trailers for lots of jobs). We ran a 10 day loop up through NE Alabama, into NW Georgia and home in early June, and Pete never towed smoother. We run the GYEs around 70 psi (they seem to never lose air, unlike the GYMs), balanced the tire/rim when mounted, and went with screw-in metal valve stems.

In reading the threads on the GYEs here, and other study, I am pretty sure Airstreams from about 4500 lb gvwr and up now come with GYE Load Range Es. It just makes sense with the tire rating and weight of the "larger?" size coaches.

Go ahead and buy your 2018 with the GYEs, you'll probably like them! Hope this helps.
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Old 07-19-2017, 04:54 AM   #13
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Allow me to clarify:

Load ratings are normally delineated by the use of letters (C, D, E, etc). That rating not only determines the maximum load, but also the maximum inflation pressure FOR A GIVEN SET OF CONDITIONS. Those conditions are usually the common way the tire is used. Please note that there are other ways of delineating the load carrying capacity of tires, but the use of Load Ratings is the most common.

Speed ratings are also delineated by letters (M, N, S, T, etc) That rating delineates the maximum speed FOR A GIVEN SET OF CONDITIONS. Those conditions are usually the common way the tire is used.

HOWEVER, the maximums delineated by both the load rating and the speed rating are not absolute and can be changed if the tire is used under a different set of conditions usually delineated in the notes to the load table.

In the case of ST tires, the load rating is predicated on a 65 mph max – even if the speed rating says otherwise. The intent is for there to be a speed safety margin when the tire is used according to the load table. HOWEVER, there are provisions which allow for higher actual usage speeds – and those are also delineated in the published load tables.
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Old 07-19-2017, 05:30 AM   #14
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Load inflation chart

This was posted in another thread about the tires, but here it is again.
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Old 07-19-2017, 06:19 AM   #15
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We have one trip under our belt (~700 miles) with everything from slow mountain switch backs to 70 mph Interstate driving with the new tires.
The tires are run with ~65 psi pressure with ~1850 lbs of weight per tire.
At the peak of high speed running we gained about ~5 lbs tire pressure which remained steady.
As a comparison to the previous Carlisle tires I can't say that there was much difference in towing - everything seemed just fine. I am lucky to say that I never had trouble with the Carlisles nor did they ever loose air except for seasonal adjustments.
The new GYE load range E tires were physically heavier than the previous Carlisle load range D tires. Even the tire dealer remarked they were heavier than other ST tires.
The new tires are load range E (what was available) and speed rated at 87 mph as stamped on the sidewall with a max of 80 psi.

My sisters Airstream trailer is outfitted with the Michelin 235/75/15 tires. The two trailers are stored side by side in my yard. When you physically compare the Michelin with the GYE, the GYE looks like a tiny donut. If Good Year had not brought out this new Endurance tire my trailer would have been sporting the Michelin tire.
A change to 16" tires would have been the best but I didn't want to spend the extra money on rims with this new option.
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Old 07-19-2017, 08:34 AM   #16
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Quote:
Originally Posted by crispyboy View Post
My sisters Airstream trailer is outfitted with the Michelin 235/75/15 tires. The two trailers are stored side by side in my yard. When you physically compare the Michelin with the GYE, the GYE looks like a tiny donut.
Assuming your GYE are 225/75/15 then the increase in the appearance is from the jump from 225 to 235. Everything is larger, but in proportion.

Lots of good information here, thanks to everyone.
Here's a chart that shows my first confusion, speed rating E is 43 MPH. (I now stand corrected)
If I see a tire speed rated A1, it better be on a wheelbarrow.
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Old 07-19-2017, 08:43 AM   #17
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BTW, one dealer wanted to sell me a new 2017 with GYM.
When I asked if we could switch tires (I was willing to pay something) I was flatly told that there's nothing wrong with GYM and all the problems were from people not inflating properly.
When I countered with, "Then how do those same folks switch to Michelins and suddenly the problems go away?"
He looked at me like I had just passed gas in church.

I see if I have a choice of tires, the GYE look to be a good compromise and maybe keep them until I need replacements.
Then decide if the 16" upgrade benefits outweigh the cost.
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Old 07-19-2017, 08:45 AM   #18
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So the million dollar question now is how fast can we safely drive with these tires?
Is going 75 to keep with traffic when the situation warrants OK or are here other reasons to stick with the former 65 max? Or, do these tires just give a safety cushion to 65 by not driving at its max speed?
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Old 07-19-2017, 09:00 AM   #19
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Quote:
Originally Posted by AirstreamCSH View Post
So the million dollar question now is how fast can we safely drive with these tires?
Is going 75 to keep with traffic when the situation warrants OK or are here other reasons to stick with the former 65 max? Or, do these tires just give a safety cushion to 65 by not driving at its max speed?
Not really a million dollar question as Good Year specs the tire for a speed rating of 87 mph as long as the other criteria of weight/psi criteria are met.
At this point only time/use will tell about the actual robustness of the tire and if the end user keeps up with routine inspection, proper inflation and doesn't hit too many curbs or debris in the road. I had good luck with my original ST tires but I watched them like a hawk during use and took the weight off of them in the off season.
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Old 07-19-2017, 09:20 AM   #20
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My trailer shipped with Goodyear endurance tires load range e from the factory without any option, it just came that way. Not sure the speed ratin, I don't go over 60.
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