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Old 09-17-2015, 06:48 PM   #1
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Stirring the Trailer Tire Pot

Just wanted to ask some questions.

What do you think about the Greenball tires carried by Costco right now? They are Speed range L rated! That means 75 mph!! I've read on this forum and other tire sites that ALL trailer tires are only rated to 65 mph. This is for sure a conflict of statements or ratings.

The tires at Costco are the Greenball Towmaster SS Special Trailer Radial Tire and if you look them up on the Greenball website they are clearly listed as speed range L. Is there a special speed range for trailer tires?

What are the thoughts... experiences. Do these tires with a similar load rating give you more safety margin if swapping 1 for 1 on tire size and load range for another brand of tire?

I now have almost 10,000 miles on my 2 year old tow max tires with no appreciable sign of wear or degradation. But keeping in mind I will have to replace in a year or two. I do think I have a lot of margin on my load ratings with my particular trailer setup as well...about 3000 lbs if I did my math correctly.
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Old 09-17-2015, 08:19 PM   #2
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Can't say I have read much about the Greenball tires, but the little I have has been mixed....

It seems some manufactures are producing st tires that are rated above 65mph now. Recently read (think it was here) that Maxxis are rated higher per an email from Maxxis (can't remember the actual speed). Carlisle is also rated higher, depending on the size tire. 16"-75mph, 15"-81mph, was 87mph but due to a gov't tarrif Carlisle changed the rating, 14"- I think were either 81mph or 87mph.

I have the same thought concerning the higher rated speed vs the old 65mph rating. The more margin there is, the better. Same as buying the next higher load range tire for more of a cushion for the max weight rating.

Have you weighed your tt? If so, how much does it weigh, and what tires do you currently have? Are you using the total trailer weight, or just the actual axle weight when hooked up when you figured the margin?
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Old 09-17-2015, 08:47 PM   #3
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The Goodyear G 614 which JAYCO is now offering as an option, on at least the PINNACLES, is rated at 75. I have seen the info on Greenballs, but what I question is how they can claim that their "F" rated 12 ply tire can carry 3800 + at 90 psi when the Goodyear "G" rated 14 ply is only 3750 at 110 psi. One reason why both have the higher speed rating is they are "Steel belted" compared to the "Nylon belts" in standard trailer tires.
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Old 09-17-2015, 11:41 PM   #4
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I saw them but it would take a week to get them I needed to go Labor day. I went with Hercules D range tires, on recommendation of sales guy who used them on his racing trailer he used 2 years regularly w/o issues, they are made by cooper tire in GA (another reason). I got Hercules for a great price too, balanced as well by the shop. Look around you may find a good deal. I am not sure on quality of Greenball, might be great tire but you don't know.
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Old 09-18-2015, 07:54 AM   #5
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I have never heard of Greenball tires but Costco is very good about standing behind what they carry..
Speed rating.. you are towing how many tons of trailer? Do you really need to go 75 with your loved ones on board? Sure you can do it 1000 times but when something goes wrong that extra speed can be a killer...
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Old 09-18-2015, 08:16 AM   #6
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Quote:
Originally Posted by t2daniel View Post
... I've read on this forum and other tire sites that ALL trailer tires are only rated to 65 mph. This is for sure a conflict of statements or ratings.

...
You are correct. The 65 mph is a minimum DOT standard as far as I know. Those that are rated higher also meet the 65 mph minimum though.

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Old 09-18-2015, 09:49 AM   #7
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Quote:
Originally Posted by Seann45 View Post
I have never heard of Greenball tires but Costco is very good about standing behind what they carry..
Speed rating.. you are towing how many tons of trailer? Do you really need to go 75 with your loved ones on board? Sure you can do it 1000 times but when something goes wrong that extra speed can be a killer...
My car tires are rated at over 200km/h. Doesn't mean I drive that fast. I would rather drive 65mph on a tire rated for 75 than one rated for 65......

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Old 09-18-2015, 10:20 AM   #8
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Originally Posted by VicS1950 View Post
You are correct. The 65 mph is a minimum DOT standard as far as I know. Those that are rated higher also meet the 65 mph minimum though.

vic
It is also the maximum speed on those tires. Just like the Michelin XZE MH tires are rated at a maximum of 75. GMC actually governed the KODIAKS that were used for MH to 75 mph.
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Old 09-18-2015, 10:39 AM   #9
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It is also the maximum speed on those tires. Just like the Michelin XZE MH tires are rated at a maximum of 75. GMC actually governed the KODIAKS that were used for MH to 75 mph.
65 mph max is apparently not the case for Goodyear Marathon ST tires.

As was pointed out, note that in the PDF they refer 10 psi above vehicle recommended tire pressure (and not above max sidewall pressure as I misinterpreted) for speeds above 65 mph.

https://www.tirerack.com/images/tire...plications.pdf

DOT speed rating is not necessarily speed limited.

As I watch other people towing pass me on the interstate I must believe that regular trailer tires are good for above 65 mph or there'd be a bunch more blowouts. My bet is that more people pull trailers above 65 mph than like I do at around 60 mph. (Now that I'm older.)

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Old 09-18-2015, 11:12 AM   #10
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Originally Posted by VicS1950 View Post
65 mph max is apparently not the case for Goodyear Marathon ST tires.

As was pointed out, note that in the PDF they refer 10 psi above vehicle recommended tire pressure (and not above max sidewall pressure as I misinterpreted) for speeds above 65 mph.

https://www.tirerack.com/images/tire...plications.pdf

DOT speed rating is not necessarily speed limited.

As I watch other people towing pass me on the interstate I must believe that regular trailer tires are good for above 65 mph or there'd be a bunch more blowouts. My bet is that more people pull trailers above 65 mph than like I do at around 60 mph. (Now that I'm older.)

vic
That is true but only for the Marathon which, if you follow all the threads on various sites, have also had their share of problems.

However the industry standard is 65.

To quote Goodyear, "Industry standards dictate that ST tires are restricted to a speed of 65 mph unless a different speed restriction is indicated on the tire sidewall. If speeds from 66 to 75 mph are used, the tire cold inflation pressure can be increased by 10 psi without any increase in load. ó Goodyear Tire Company"

The GOODYEAR G 614 is also rated at 75, and can be used safely on a TT/FW.

I, like you, stay at 60-62 and just hope that I don't find the person who "FLEW" by me at 75 +/- off the road or in the median since they blew a tire and lost control.

Safe travels.
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