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Old 09-28-2010, 07:45 AM   #1
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Could This Be The Solution

The solution to our tire problems? A 235/75 15 LT tire in load range D.

Pirelli Scorpion ATR

It's called an On/Off road, all terain tire, but that mostly describes the tread design, and I wonder if this would in any way prevent it's use in trailer service.

Pirelli is a well respected tire manufacturer, it's an LT tire in load range D, so it should handle the weight OK, it's a 15" so no need to replace wheels. They are a little more expensive than ST tires, but who wouldn't be willing to pay a little more for a tire that would carry the weight and stay together?
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Old 09-28-2010, 08:22 AM   #2
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I think this tire would work well for my 25 Safari.
Maximum load of the tire is about 2225 pounds. I like one tire to be able to carry the entire load on one side in case of a blowout. On my Safari GVW is about 6000 pounds. Subtract the hitch weight and this tire comes close to meeting the test.
I would be concerned about using this tire on a heavier double axle Airstream like a classic or bigger Safari. In that case, I would go to 16 inch wheels or use an E rated ST tire.
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Old 09-28-2010, 08:33 AM   #3
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What is the maximum psi on that tire?
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Old 09-28-2010, 08:50 AM   #4
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It's not designed for TT use.
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Old 09-28-2010, 08:51 AM   #5
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What is the maximum psi on that tire?
The web site states max load as 2335 lbs and the max inflation as 65 psi.
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Old 09-28-2010, 08:56 AM   #6
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It's not designed for TT use.
That's right, and those that are designed for trailer use (ST), are no good. People who are using LT (Light Truck) tires, are having much more luck with the tires actually staying in one piece.
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Old 09-28-2010, 10:34 AM   #7
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Please enlighten me. What makes an ST better for trailer applications? I know that they are designed for trailer use but what is the actual problem with running LTs?
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Old 09-28-2010, 10:48 AM   #8
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Please enlighten me. What makes an ST better for trailer applications? I know that they are designed for trailer use but what is the actual problem with running LTs?
Take a look here. Trailer Tire Facts - Discount Tire
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Old 09-28-2010, 10:54 AM   #9
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Please enlighten me. What makes an ST better for trailer applications? I know that they are designed for trailer use but what is the actual problem with running LTs?
ST tires are built w/ heavier sidewalls, supposedly; they are also sometimes of bias ply rather than radial construction. In the past (1970s) , Airstream has supplied their trailers with LT radial tires; many of us run them today, as quality standards appear higher for such tires than for tires aimed at the very cost-sensitive trailer market. It appears to me that ST tires are a means for delivering the sturdy tire carcass needed for trailering w/o the other expenses associated with tires aimed at the LT market. Most trailer tires become rotted with age/ozone rather than worn out due to use, in contrast to what happens w/ LT tires.

Like many contentious subjects here, you'll find lots of opinions on this topic. Personally, we run LT tires on both the truck and trailer. When folks complain about the rate of tire failure w/ ST tires on their heavier Airstreams, several people recommend switching to 16" LT load range E tires. I'll likely do this when we need tires again, even though our 'stream isn't very heavy.

If you're worried about trailer tire failures, install a pressure monitoring system; this will prevent the most common source of failures - undetected leaks leading to overheating. There's a reason these are now mandatory on new vehicles.


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Old 09-28-2010, 12:33 PM   #10
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I do not take Discount Tire's Trailer Tire Facts as the Gospel, because in the first paragraph there are some statements that are just wrong:

Trailer Tire Applications
  • Trailer tires are designed for use on trailer axle positions only. They are not built to handle the loads applied to, or the traction required by, drive or steering axles.
  • An "LT" designation on a trailer tire size specifies load range only. It is not designed for use on light trucks.
  • Do not mount "ST" or "LT" trailer tires on passenger cars or light trucks.
An "LT" designated tire IS designed and intended for use on a Light Truck.

"LT" tires are supposed to be mounted on Light Trucks.
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Old 09-28-2010, 03:50 PM   #11
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I do not take Discount Tire's Trailer Tire Facts as the Gospel, because in the first paragraph there are some statements that are just wrong:

Trailer Tire Applications
  • Trailer tires are designed for use on trailer axle positions only. They are not built to handle the loads applied to, or the traction required by, drive or steering axles.
  • An "LT" designation on a trailer tire size specifies load range only. It is not designed for use on light trucks.
  • Do not mount "ST" or "LT" trailer tires on passenger cars or light trucks.
An "LT" designated tire IS designed and intended for use on a Light Truck.

"LT" tires are supposed to be mounted on Light Trucks.

It is just information. Take what you what from it and leave the rest. What can you consider "Gospel" these days? Someone is allways trying to spin info to suit themselves or there bottom line. All a person can do is research and make the best choice for the situation that is in front of them. Good Luck!

Google LT vs ST tire. LT vs ST - Google Search

Would I run LT tires on a trailer? Maybe, If I need to.

Would I run ST tires on a truck? Not likely.
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Old 09-28-2010, 04:20 PM   #12
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All this tire searching on my part is driven by two things....the fact that people are continuing to have lots of trouble with "ST" tires, and a friend of mine found two Goodyear Marathon tires with tread seperation on his '07 25' Airstream. As far as other apearances, the tires look like new, and he estimates the tires have about 10,000 miles on them, max, and have never been run low on air pressure.

This type of premature tire failure is in my opinion, totally unexceptable.

I find it interesting that the minimum speed rating for any tire sold in the USA for any vehicle that carries human passengers is 87MPH, yet tires for a trailer pulled by a passenger hauling vehicle has tires rated for only 65MPH.
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Old 09-28-2010, 04:36 PM   #13
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Considering the 65mph rating for ST tires, even the self appointed experts seem to get it wrong. See: How to Choose the Right Camper Tires & RV Tires

Where they say this about ST tires:

Camper and trailer tires are stamped with "ST" on the sidewall. The 'Special Trailer' (ST) tires are constructed for better high speed durability, extended towing time and damage resistance under heavy loads.

What are they thinking?
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Old 09-28-2010, 05:07 PM   #14
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"the fact that people are continuing to have lots of trouble with "ST" tires" is not a fact. There is no evidence to support that statement, only hearsay. If there was, the National Highway Safety Administration would have stepped in a long time ago.
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