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Old 03-19-2012, 09:34 PM   #1
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Exclamation ST vs. LT Tire problems

I had a blow out yesterday. Tires are Goodyear Marathon st235/80 R16 made in China. I've heard bad things about "China Bombs" but need advise on replacement tires. I've researched replaced tires but all 23580's seemed to be made in China...Help.

2010 Cardinal 3515 40 foot 15K towing weight.
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Old 03-19-2012, 09:57 PM   #2
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If you want to stay with ST tires, check out Maxxis. They make a very good ST235/80R16 Load Range E tire. They're not China bombs.
If you want to go to LT tires, Michelin Ribs or BF Goodrich Commercial T/A seem to be a popular choice amongst the RV'ers.
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Old 03-19-2012, 10:52 PM   #3
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Was on the phone with a tire safety guy last week and he had an unusual twist in the ST vs LT debate.

LT tire tread is designed to provide optimum traction under power and turning performance in all weather conditions. As such, the tread design provides for high friction in side loading to provide "grip" while turning. It also has an aggressive tread for high friction when used as a drive tire. It also has channels for water to squirt out the sides to keep the drive and steering wheels from hydroplaning. These channels also provide high friction when the tire is twisted in hard turns.

ST tires have a unique tread design. There are only ribs and channels that follow the rotation of the tire. There are no (or few) side to side grooves and the tread itself is very "non-aggressive" to provide a minimum rolling friction for better tire life and fuel economy.

In the past, the higher tire loading in high end campers was not being served by the tire industry so to provide the load carrying capacity required they put LT tires on at the factory. Today, there are more choices available and for a given load factor better performance will come from an ST tire.

Under similar driving conditions, the ST tire will provide better gas mileage and longer tire life. During sharp turns the ST tire will crab sideways much more easily than an LT tire. This will reduce uneven wear and "scrubbing" of the tread.

ST tires also have a much higher emulsion content in the rubber since most ST tires don't get a lot of use. LT tires are run at highways speeds more often and the emulsion can lubricate the rubber more easily when the tires get hot at highway speeds. The higher content in the ST tire rubber prevents/delays dry rot in tires that don't get much use.

Paraphrased from a 2 hour conversation with
Walter C. Cannon
Executive Director
RV Safety & Education Foundation

Don't shoot the messenger...
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Old 03-20-2012, 12:11 AM   #4
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I replaced the Goodyear Marathons on my 2011 Cardinal 3450RL with 750R16 14 ply Trailer tires. It is still a tire made in China, but feel better knowing that it is a G rated tire,My tire guy also installed metal valve stems and a liquid balancer that also helps the tire run cooler.I run them at 100 psi. Just returned from a 1500 mile trip.All is good and I sold the Goodyears for 125.00 each!
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Old 03-20-2012, 08:50 AM   #5
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Excellent post, Lou. Less rolling resistance for better mileage, less sideways grip so the tire doesn't wear as much during turns, and better compounds in the tire to prevent aging should get us all thinking about keep ST tires on our trailers.....at least I plan on it.
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Old 03-20-2012, 08:54 AM   #6
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You may want to look at the following as options:
Goodyear Commercial Truck Tires - G614 RST Details
G614 RST - Even Wear In Demanding Trailer Applications.

http://www.goodyear.com/cfmx/web/tru...rodline=160026
G947 RSS Armor MAX - Enhanced Toughness For High-Scrub Applications..

http://www.bridgestonetire.com/produ...d/Duravis_R250
The above are commercial tires suitable for trailer user
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Old 03-20-2012, 08:57 AM   #7
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Quote:
Originally Posted by mtnguy View Post
Excellent post, Lou. Less rolling resistance for better mileage, less sideways grip so the tire doesn't wear as much during turns, and better compounds in the tire to prevent aging should get us all thinking about keep ST tires on our trailers.....at least I plan on it.
Ditto,

I am working on a modification for the wheel well area to make the tire explosion proof. It won't prevent damage to the skirts but will protect the area above the tires and far enough front to back to take into account the tread seperating and slapping the trailer. Just waiting for the material to make the shields out of.
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Old 03-20-2012, 09:20 AM   #8
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So on my fiver I have Road Rider st225-175-r15. Is this a tire made in China? Is it a good tire? How do you know if it was made in China?
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Old 03-20-2012, 09:34 AM   #9
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Quote:
Originally Posted by jriddering View Post
So on my fiver I have Road Rider st225-175-r15. Is this a tire made in China? Is it a good tire? How do you know if it was made in China?
Not all tires made in China are bad; just like all tires made in the USA are not "good." It is a question of price and quality control. Name brand tires, like Goodyear, Pirelli, Goodrich, etc, offer a second level of quality control over and above what is required by DoT.

Here is the web site for manufacturer codes:
DOT Codes

Here is how to "read" a tire:

For example: in the pictured tire, find the molded code MDHH right after the DOT
The first 2 digits are WHO actually made the tire.
In this case: Goodyear Rubber Company in Gadsden Alabama.

Look as well at the 4 numbers 2510
This is the manufacturing date code.
this tire was made in the 25th week of 2010
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Old 03-20-2012, 09:56 AM   #10
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the pic I have of tire looks like it says 83B4. So that would be Shandong China? What are the second 2 digits mean? I will have to look at tire tonight again.
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