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Old 02-06-2016, 10:43 PM   #31
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New ST Carlisle's are speed rated for 85

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Old 02-07-2016, 08:02 AM   #32
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Changing Industry Standards

Even the industry doesn't yet seem to know that the standard for ST tires is changing. I've replaced all of my trailer tires with 14 and 15 inch D rated Taskmaster tires with a speed rating of M, which is 81 mph. Why settle for less? Even etrailer, where I purchased the tires, didn't know the speed rating, but it is molded into the tire. If we refuse to buy tires rated for 65 mph, they'll quit making them eventually.
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Old 02-07-2016, 01:19 PM   #33
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My G614 came on the trailer from the factory. I guess you would have to call Cedar Creek on this one. I guess they are just stupid for installing the G614 on this camper.


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Tire manufacturers build tires to a set of specifications appropriate for each tire and it's intended usage. Vehicle manufacturer's may find that a specific tire will also be appropriate for their fitment purposes and make adjustments to the tire manufacturer's specifications. When they do so, such as in your case (if your G614s are mounted on 6" wide rims and identified as such on the trailer's certification label), they will also certify it to be a safe fitment via the certification process. However, because they do such things does not open the door for consumers to do the same. Consumers do not have the power of certification on their side.
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Old 02-07-2016, 01:49 PM   #34
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I may prefer to have my tires rated at above 65 but you will not likely see me pulling a trailer over 65 mph................ Pulling the trailer above 65 is no big deal......stopping 20,000 plus pounds going over 65 mph can be a big deal when you need to it it quickly........... In my years of traveling I see it all to often a 100 plus car pile up on I77 they all couldn't stop in time ....... even saw (it happen) two vehicles hit head on on a two lane road the Ford Focus lost even his life, the tractor trailer saw minor damage. Even though he was in the right he will live with the image forever............


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Old 02-07-2016, 01:53 PM   #35
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Tire manufacturers build tires to a set of specifications appropriate for each tire and it's intended usage. Vehicle manufacturer's may find that a specific tire will also be appropriate for their fitment purposes and make adjustments to the tire manufacturer's specifications. When they do so, such as in your case (if your G614s are mounted on 6" wide rims and identified as such on the trailer's certification label), they will also certify it to be a safe fitment via the certification process. However, because they do such things does not open the door for consumers to do the same. Consumers do not have the power of certification on their side.
This is rather questionable logic.
I can see no reason why an upgraded tire would be a problem. Who cares if it's the same as what the manufacturers originally spec, if it exceeds it?

Remember the Ford/firestone fiasco of about 12-15 years ago?? Have you read anything about the sandpiper/sierra campers that were sent out with axle/wheel/tire campers that were WAY too light and ended up being very problematic?

Manufacturers get it wrong sometimes and whatever tire "authority" you think you have is severely flawed in your stating that someone is wrong in upgrading to g614's from their original 10ply lesser brand tires.
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Old 02-07-2016, 01:57 PM   #36
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If the tire makers use some "standard" making these things they sure suck at it!!

I know this brought bad blood last time this was posted, but Airdale, I though the change in standard was on a paper from years ago and never went anywhere. I remember this, I think, from when I was looking to upgrade to 15" rim a few months back.. Which I never did because winter came.
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Old 02-07-2016, 01:57 PM   #37
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I used 15" LT tires on all my F150s maybe I misunderstood you You didn't say you were talking about 10 ply tires. LT 15s Tires are made by most of the manufacturers Goodyear, BF Goodrich and the others .

There are a number of 15" LT tires but not as high as LRE. The LT235/75R15D is a little larger than the ST225/75R15D but is very close to the same max load capacity at 2335#.
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Old 02-07-2016, 01:58 PM   #38
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Special Trailer (ST) Tire Speed Ratings

Unless assigned a specific Speed Rating, industry standards dictate tires with the ST designation are speed rated to 65 mph (104 km/h) under normal inflation and load conditions.
However, Goodyear Marathon and Power King Towmax STR tires featuring the ST size designation may be used at speeds between 66 and 75 mph (106 and 121 km/h) by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load.
Do not exceed the wheel's maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).
The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.
Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.
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Old 02-07-2016, 02:10 PM   #39
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There are a number of 15" LT tires but not as high as LRE. The LT235/75R15D is a little larger than the ST225/75R15D but is very close to the same max load capacity at 2335#.
I was just going by the blanket statement that was made that you could not buy 15 in LT tires which is not true.
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Old 02-07-2016, 02:50 PM   #40
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This is rather questionable logic.
I can see no reason why an upgraded tire would be a problem. Who cares if it's the same as what the manufacturers originally spec, if it exceeds it?

Remember the Ford/firestone fiasco of about 12-15 years ago?? Have you read anything about the sandpiper/sierra campers that were sent out with axle/wheel/tire campers that were WAY too light and ended up being very problematic?

Manufacturers get it wrong sometimes and whatever tire "authority" you think you have is severely flawed im your stating that someone is wrong in upgrading to g614's from their original 10ply lesser brand tires.
The subject above is about rim size, not tire fitment to the trailer.

There are no firm tire industry standards for "plus sizing" RV trailer tires. That's why it's so hard to get a LT tire manufacturer to authorize the use of their LT tires as replacements for original equipment ST tires. However, the G614 IS a trailer tire. But, will the trailer manufacturer authorize it as a replacement for a smaller tire is the question? Brands have nothing to do with size and load capacity.

If you want to see a runaround about tire usage read the "not covered" section of this warranty package. If you are honest with Michelin and ask them if it's ok to use any of their LT tires to replace your OE ST tires they are going to say, NO! Your trailer owner's manual is going to tell you in the tire safety section to use replacement tires like the ones that came on it. Michelin has that covered in the last bullet in the " not covered" heading.

What an owner does is their responsibility. What NHTSA and the tire industry say is within the safety ropes. Once you step outside the ropes you are at your own risk.

http://media.michelinman.com/content...omise_Plan.pdf
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