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Old 01-27-2020, 09:53 AM   #1
Logan X
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ST or LT- which do you prefer

I wanted to hear what everyone’s opinion is on ST or LT tires and why. I run Goodyear Endurance ST tires and I’ve been happy with them. I prefer the ST tires because they were made specifically for trailer duty. I would love to hear what others are doing.
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Old 01-27-2020, 10:07 AM   #2
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I prefer ST for the same reason. My G rated Provider ST Tires are working well just completed the second full season.
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Old 01-27-2020, 10:16 AM   #3
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Mike there have been several threads discussing this topic in the past. You will hear the case made that the change would "violate" the manufacturers tag on the trailer and arguments that LT tires are better. In my thinking ST tires that are spec. for the trailer should be used and now days there appears to be several good performing brands available. I stayed with the ST tires and went one rating higher as the rims are rated to handle them.
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Old 01-27-2020, 10:44 AM   #4
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Totally agree with Marshall!
LT means "light truck" which your RV is not!
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Old 01-27-2020, 11:02 AM   #5
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The real question is "less filling" or "more taste"... sorry, the horse is dead.
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Old 01-27-2020, 11:05 AM   #6
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Quote:
Originally Posted by flybouy View Post
<clip> You will hear the case made that the change would "violate" the manufacturers tag on the trailer and arguments that LT tires are better. <clip>
When I was replacing my Trailer Kings on my Bullet I inquired about putting LT tires on vs ST. I was informed that they would not consider putting LT tires on the TT as the sticker specified ST.

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Originally Posted by travelin texans View Post
<clip>
LT means "light truck" which your RV is not!
Interestingly enough, on another forum (I think iRV2) I've read some discussion where there are TT manufacturers that do specify LT vs ST tires for certain models.
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Old 01-27-2020, 03:38 PM   #7
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I'm not sure about this, but are 15 inch tires that are LT rated even available? Even if they were, it is possible that the weight capacity would not be enough compared to the ST tire in the same size that would work on your trailer. The weight capacity ratings for ST tires compared to the same size LT tires are much higher, so that is the reason ST tires are usually specified.
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Old 01-27-2020, 03:57 PM   #8
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Goodyear makes run flat Wranglers in 15" that would fit but they have a load index of 105 (2039 lbs) which seems too low for most trailers sporting 15" rims. I am guessing 6 ply tires based on the load range and suspect the sidewalls wouldn't be up to trailer towing but I do think 15" LT tires are out there... I think these are LT tires but not sure as the description really doesn't say:

https://www.amazon.com/Goodyear-Wran...JR5DSD1QENVHR9
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Old 01-27-2020, 04:01 PM   #9
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LT tires run cooler.
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Old 01-27-2020, 04:20 PM   #10
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Quote:
Originally Posted by wiredgeorge View Post
Goodyear makes run flat Wranglers in 15" that would fit but they have a load index of 105 (2039 lbs) which seems too low for most trailers sporting 15" rims. I am guessing 6 ply tires based on the load range and suspect the sidewalls wouldn't be up to trailer towing but I do think 15" LT tires are out there... I think these are LT tires but not sure as the description really doesn't say:

https://www.amazon.com/Goodyear-Wran...JR5DSD1QENVHR9
George, if you look at the photo on that link, it's a P235 75R15 M&S, so not even an "LT" tire but a "P rated tire". According to the tire model number, you can find the entire Goodyear specs here: https://www.goodyear.com/en-US/tires...al/sizes-specs It's rated at 2028 max load with 35PSI as max inflation pressure. Definitely NOT a good candidate for any RV sized trailer.
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Old 01-27-2020, 04:23 PM   #11
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LT tires run cooler.
There was a time when ST tires were bias ply construction and that may have been true, but today's radial ST tires are no more likely to "run hot" than any other radial tire of similar construction.
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Old 01-27-2020, 05:00 PM   #12
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About 10 -15 cooler on the truck than the trailer.
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Old 01-27-2020, 05:17 PM   #13
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About 10 -15 cooler on the truck than the trailer.
Looking at the "truck" and the "trailer"

Truck looks like a 2004 GMC diesel
Trailer looks like a Montana High Country 331

If I remember correctly, there's about 3000 + pounds difference in the truck at GVW and the trailer at GVW, so naturally, there will be a "cooler running tire" on the truck.
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Old 01-27-2020, 05:25 PM   #14
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Running close to the same wt. on the rear of the truck as each on the trailer. 5900 rear truck 11500 approx. trailer.
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Old 01-27-2020, 05:36 PM   #15
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In my thinking the only definitive test would be to put a set of LT's on one trailer axle and same sized and rating ST's on the other and record the temps.
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Old 01-27-2020, 05:46 PM   #16
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According to this article , https://www.lesschwab.com/article/tr...questions.html,
thttps://www.westmarine.com/WestAdvisor/Trailer-Tire-Basicshey

and several others the ST tires have straighter tread ribs to allow greater airflow so they run cooler.
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Old 01-27-2020, 05:57 PM   #17
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Quote:
Originally Posted by 77cruiser View Post
LT tires run cooler.
Quote:
Originally Posted by 77cruiser View Post
About 10 -15 cooler on the truck than the trailer.
So our 2005 Copper Canyon came from the factory with LT tires. They are 235/85-16E’s rated at 3,042# ea. The GVWR of the 5er is 12,360# and we run a 2,700# pin.
LT’s have stronger side walls and higher speed rating (106 mph).
My view is ST is a tire built to lesser standards so they can be built and sold cheaply.
Semi’s don’t have different tire carcasses for trailer tires, maybe a different tread pattern to start with, but truckers will move worn drivers to trailer positions to get the most life out of the tread.
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Old 01-27-2020, 06:03 PM   #18
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Quote:
Originally Posted by rhagfo View Post
So our 2005 Copper Canyon came from the factory with LT tires. They are 235/85-16E’s rated at 3,042# ea. The GVWR of the 5er is 12,360# and we run a 2,700# pin.
LT’s have stronger side walls and higher speed rating (106 mph).
My view is ST is a tire built to lesser standards so they can be built and sold cheaply.
Semi’s don’t have different tire carcasses for trailer tires, maybe a different tread pattern to start with, but truckers will move worn drivers to trailer positions to get the most life out of the tread.

Only sometimes they have special steer tires.
I kinda had that thought about trailer tires being cheaper made.
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Old 01-31-2020, 06:45 AM   #19
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Originally Posted by rhagfo View Post
So our 2005 Copper Canyon came from the factory with LT tires. They are 235/85-16E’s rated at 3,042# ea. The GVWR of the 5er is 12,360# and we run a 2,700# pin.
LT’s have stronger side walls and higher speed rating (106 mph).
My view is ST is a tire built to lesser standards so they can be built and sold cheaply.
Semi’s don’t have different tire carcasses for trailer tires, maybe a different tread pattern to start with, but truckers will move worn drivers to trailer positions to get the most life out of the tread.
According to this brochure....https://www.keystonerv.com/media/104...ochure.pdf.pdf … your trailer should have been equipped with ST225/75R15 tires. However, in model years 2004,2005 & 2006 Keystone did use a lot of LT235/85R16 tires. So just maybe they were offered as optional for your trailer. Many of them fitted to 6000# axles were the Uniroyal Laredo brand and they developed large sidewall bubbles/blisters. In 2006/2007 all were phased out with ST tires being their replacements. Your trailer is a light weight for the LT235/85R16 tires and I'd keep right on using them.
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