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Old 05-08-2013, 02:19 PM   #21
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Originally Posted by force View Post
Serious question...is there real evidence that 2-3mph over the rating drastically increases chances of a blow out?

Do tire manufacturers include any kind of buffer factor on tire ratings?

I did read specs and know that a few more PSI gets me another 10mph out of them, so I'm hardly stretching the limits of the tire at 67 mph, just curious if anyone has any facts on this one (with an apologetic caveat that I have not tried to search this topic outside of this thread)

The above aside, I think next time I'll try to stay within the 60-62mph range to see if I can make a solid MPG gain.
or you can just by an ST tire that is rated at 75 mph at max load.

When pulling my boat in the Ozark mountains it is easy to hit 75mph going downhill into the next hill. It makes me feel better that my tires are rated at 75mph.
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Old 05-08-2013, 02:24 PM   #22
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Better to be late than "the late".
Exactly. And instead of worrying about the mph limitations of my tires, I'm more concerned with the limitations of my brakes and reaction times. When those speeders wreck up ahead of me, I want to be able to stop in time.
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Old 05-08-2013, 02:27 PM   #23
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or you can just by an ST tire that is rated at 75 mph at max load.

When pulling my boat in the Ozark mountains it is easy to hit 75mph going downhill into the next hill. It makes me feel better that my tires are rated at 75mph.
Good point. That's what I run on my snowmobile trailer. My camper tires are only a couple months old, but I'll look to upgrade when the time is due.
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Old 05-08-2013, 03:13 PM   #24
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or you can just by an ST tire that is rated at 75 mph at max load.

When pulling my boat in the Ozark mountains it is easy to hit 75mph going downhill into the next hill. It makes me feel better that my tires are rated at 75mph.
I'm just learning about tires... which ST tires are rated to 75mph at max load?
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Old 05-08-2013, 03:19 PM   #25
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I'm just learning about tires... which ST tires are rated to 75mph at max load?
Greenball Tires - Towmaster
speed rating "L"

chart:
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Old 05-08-2013, 03:58 PM   #26
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So this is kinda funny. I run these tires on my sled trailer:

Loadstar 5.70x8 C/6PR @ 75PSI. The tire says "High Speed" on it, but there is not a speed rating identifier anywhere on the tire. The only other info is the DOT #, which is 2QA4 Y08, but that doesn't translate directly to how DOT numbering works on LT and other auto tires...

So I called the manufacturer and asked them to define "High Speed". The answer was they test at 65MPH, but if properly inflated higher speeds are no issue. I said sure but highway speeds out west are 75+, and I've hit 85mph w/ these once or twice. Am I at risk for blowout etc? "No, you should be fine".

That is not exactly the warm & fuzzy I was expecting to get....
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