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Old 07-12-2013, 11:29 AM   #11
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Originally Posted by jeeplj8 View Post
What is interesting to me is that Goodyear is advocating raising tire pressure 10 psi ABOVE the max posted on the tire, while Maxxis is stating you should NEVER go above the "MAX" psi.

In other words, Goodyear is saying it is OK to go to 75 psi on a 65 psi tire, which may not be OK on other brands.

Well, at least it is simple and straightforward...
You need to re-read that. It says up to 10 PSI above the pressure required for the load; but no higher than the sidewall or rim rating.
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Old 07-12-2013, 11:37 AM   #12
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not to get all lawyery, but:

Based on these industry standards, if tires with the ST designation are used at speeds between 66
and 75 mph (106 km/h and 121 km/h), it is necessary to increase the cold inflation pressure by 10
psi (69 kPa) above the recommended pressure for the rated maximum load.


The "recommended pressure for the rated maximum load" is in fact 65 psi. Goodyear is specifically advocating using a tire pressure above "rated maximum load" for high speed driving. They do note this does not increase the load carrying capacity.
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Old 07-12-2013, 11:56 AM   #13
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Quote:
Originally Posted by jeeplj8 View Post
not to get all lawyery, but:

Based on these industry standards, if tires with the ST designation are used at speeds between 66
and 75 mph (106 km/h and 121 km/h), it is necessary to increase the cold inflation pressure by 10
psi (69 kPa) above the recommended pressure for the rated maximum load.


The "recommended pressure for the rated maximum load" is in fact 65 psi. Goodyear is specifically advocating using a tire pressure above "rated maximum load" for high speed driving. They do note this does not increase the load carrying capacity.
I think Goodyear's terminology is confusing, at best.. I read "rated maximum load" as being equal to *YOUR* maximum load on the tire. Meaning, the PSI required to carry the load that you're putting on the tire.

In fact, looking at this page on
GoodyearRVTires.com, they use the same terminology, but it reads slightly differently:
Quote:
  • Select a tire with load carrying capacity designed to handle the maximum load point
  • For each axle determine the correct inflation pressure needed for that size tire to handle the maximum load
I think their reference to "maximum load" isn't the maximum load that the tire is capable of carrying, it's the "maximum load" you're putting on the tires. Because, poking around that GoodyearRVTires.com site- their recommendation is that you weigh each individual wheel and then go with the highest weight/load capacity required and keep the tires at the same PSI.

BUT- it's definitely unclear.
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Old 07-12-2013, 12:01 PM   #14
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"Maximum rated load" is not so much a technical term (well OK it is) but a legal term. The legal description is exactly what is posted on the tire. This was of course a little issue that came up between Firestone and Ford a few years ago. Despite testimony about industry standard rating techniques, it was agreed, and specifically stated by the court, that the legal definition of "maximum rated load" is what is printed on the side of the tire.

I am simply pointing out, and am very confident in this statement, that Goodyear has publicly stated that they recommend exceeding their own "maximum rated load" pressure.

Something tells me their internal counsel has not reviewed that statement.
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Old 07-12-2013, 12:02 PM   #15
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Quote:
Originally Posted by jeeplj8 View Post
What is interesting to me is that Goodyear is advocating raising tire pressure 10 psi ABOVE the max posted on the tire, while Maxxis is stating you should NEVER go above the "MAX" psi.

In other words, Goodyear is saying it is OK to go to 75 psi on a 65 psi tire, which may not be OK on other brands.

Well, at least it is simple and straightforward...
Well, I think it may be a moot point. If you have a 65 psi tire, you're running a load range D tire. That also means, you're likely running on rims that are limited to 65 psi. (Or, am I making that part up?) Goodyear does specifically state to not exceed the rim/wheel maximum pressure.

Though, out of curiosity - I've emailed Goodyear with the question. We'll see if they respond.
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Old 07-12-2013, 12:04 PM   #16
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Quote:
Originally Posted by jeeplj8 View Post
"Maximum rated load" is not so much a technical term (well OK it is) but a legal term. The legal description is exactly what is posted on the tire. This was of course a little issue that came up between Firestone and Ford a few years ago. Despite testimony about industry standard rating techniques, it was agreed, and specifically stated by the court, that the legal definition of "maximum rated load" is what is printed on the side of the tire.

I am simply pointing out, and am very confident in this statement, that Goodyear has publicly stated that they recommend exceeding their own "maximum rated load" pressure.

Something tells me their internal counsel has not reviewed that statement.
Interesting, I didn't know that.
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Old 07-12-2013, 12:11 PM   #17
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Well, since I apparently had nothing better to do and could not let this go, I contacted Greenball directly as they are the only company I am aware of that specifically lists their tires speed rating at L (75mph) on their website with no caveats. A very nice lady in their customer service department put me in touch with an engineer who stated "Our Maximum Rated Load is calculated at our speed rating. So that means we calculated it at 75 mph."
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Old 07-12-2013, 12:58 PM   #18
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I must be an old fart but I choose to tow at 60mph. I like knowing towing at that speed is easier on tires, suspension,the truck and myself. My 2012 Dodge Ram1500 4X4 5.7L Hemi with Husky weight distributing hitch and tow package is tow rated at 8500lbs and our 25' Surveyor SP220 weighs 5000lbs loaded so I am a bit over half of our rating so I feel comfortable at that speed. Sorry if I don't do 75 or 80 like some of my friends here in Az towing their 40foot fifth wheels on our 75mph posted highways. One friend in particular has had 2 blowouts at those speeds recently on his 38' fifth wheel on relatively new trailer tires and wonders why.
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Old 07-12-2013, 01:07 PM   #19
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Thanks guys for all the info.
It is great to know that putting Maxxis tires on my fifth was the correct move.
By upgrading to D-rated tires, I have the capability to run all day at 85 mph!
Of course, I don't run at 85 mph, so those tires should last a long, long time.
Maxxis, worth every penny.
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Old 07-12-2013, 01:08 PM   #20
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I must be an old fart but I choose to tow at 60mph. I like knowing towing at that speed is easier on tires, suspension,the truck and myself. My 2012 Dodge Ram1500 4X4 5.7L Hemi with Husky weight distributing hitch and tow package is tow rated at 8500lbs and our 25' Surveyor SP220 weighs 5000lbs loaded so I am a bit over half of our rating so I feel comfortable at that speed. Sorry if I don't do 75 or 80 like some of my friends here in Az towing their 40foot fifth wheels on our 75mph posted highways. One friend in particular has had 2 blowouts at those speeds recently on his 38' fifth wheel on relatively new trailer tires and wonders why.
Agree, those that have to tow at speeds in excess of 60-65 justify it saying they don't want to impede the flow of traffic. I guess they think the others can't see them or something. I will continue to impede traffic by creeping along @ 60-65.
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