Woodalls Open Roads Forum: At what psi can I travel 65-75mph?
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 > At what psi can I travel 65-75mph?

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full_mosey

Oklahoma

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Posted: 07/23/13 02:38pm Link  |  Quote  |  Print  |  Notify Moderator



This Maxxis pdf has the same table.

Using the table(s) above, my ST175/80R13 with 1060lbs load could run at a minimum 35psi with ~4% reserve capacity. Is there a +10lbs rule?

I run with +10lbs, or 45-50psi, why can't I travel 65-75mph?

If this a per mfgr thing, then it is no wonder we get tired(pun) of digging around in the fine print where the real ST specs are hidden!

HTH;
John

fj12ryder

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Posted: 07/23/13 02:46pm Link  |  Quote  |  Print  |  Notify Moderator

My thought would be that you can't run 65-75 mph because the chart for the ST tires gives a speed rating of 65 mph. AFAIK ST tires are all speed limited to 65 mph with an exception or two.


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ScottG

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Posted: 07/23/13 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

As Howard said, you can't run above 65 without risking tire failure because that's all your ST tires are rated for.
I would run them at max pressure so you have the benefit of all the tires capacity.


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goducks10

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Posted: 07/23/13 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

Let me know when you're running 75mph, and I'll stay home that day.

I am still wayne_tw

everywhere

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Posted: 07/23/13 03:07pm Link  |  Quote  |  Print  |  Notify Moderator

The second column should be abundantly clear.....65 MPH!

john b

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Posted: 07/23/13 03:15pm Link  |  Quote  |  Print  |  Notify Moderator

goducks10 wrote:

Let me know when you're running 75mph, and I'll stay home that day.






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Francesca Knowles

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Posted: 07/23/13 03:19pm Link  |  Quote  |  Print  |  Notify Moderator



Hi, John...I see you're still trying to clear up the same question we haven't seen answered in the other current thread this question arose in!

Let me say that this is a purely academic question for me, as I wouldn't think of towing at speeds faster than the low sixties, no matter WHAT tires I had on. Who wants to pay what I like to call "the stupid tax": huge penalties, gas-mileage-wise? The oil companies are doing just fine already...

The question has to do with an oft-repeated statement that speed limits on ST's can be exceeded under specific conditions having to do with tire pressure and load. Some folks seem to think that adding ten PSI allows for such an increase, although no one appears to be able to come up with a manufacturer directive that says so. Furthermore, some appear to think that if true, the statement constitutes a directive to exceed the tire's stated maximum pressure- a presumption that I believe to be untrue.

Hangin' around to find out what's what from the experts...


" Not every mind that wanders is lost. " With apologies to J.R.R. Tolkien

smkettner

Southern California

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Posted: 07/23/13 03:29pm Link  |  Quote  |  Print  |  Notify Moderator

+10 is a GY Marathon notation.

Personally I might inflate to max and run 65/70 but that is enough.
Go easy in the 90+ heat either way.


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fj12ryder

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Posted: 07/23/13 03:37pm Link  |  Quote  |  Print  |  Notify Moderator

Of course you'd need to make sure the wheels were also rated to the higher pressures.

Francesca Knowles

Port Hadlock, Washington

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Posted: 07/23/13 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

fj12ryder wrote:

Of course you'd need to make sure the wheels were also rated to the higher pressures.

That would be true ONLY if the "extra 10 PSI" meant raising it above the tire's max limit. I don't think that's what this "rule" means, assuming it exists at all.

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