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Old 02-05-2016, 10:10 PM   #1
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LT vs ST tires good read

Trailer Towing – ST Tires vs. LT Tires | RV 101® your education source for RV information


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Old 02-05-2016, 10:41 PM   #2
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Old 02-05-2016, 10:57 PM   #3
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Trailer Towing – ST Tires vs. LT Tires | RV 101® your education source for RV information


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Good info. Sadly there are few choices and I'm not aware of any US made ST tire. There may be a huge market if a company would begin. My new 5er came with Trailer King ST load range E tires and will be changed at 4000 miles. I read recently of Power Max just being changed after 30,000. Agree with the article no matter what you run they must be taken care of or will not last. Who knows how the delivery guy took care of them in 1200 miles from the factory in IN?
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Old 02-05-2016, 11:41 PM   #4
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Didn't learn much from this..I have Michelin XPS Ribs on my rig. They are rated for much more than my actual axle weights. (Had it weighed) They have been an excellent tire for my purposes. I have around 30,00 trouble free miles on them. I will never consider a ST tire.
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Old 02-06-2016, 12:03 AM   #5
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Good info. Sadly there are few choices and I'm not aware of any US made ST tire. There may be a huge market if a company would begin. My new 5er came with Trailer King ST tires and will be changed at 4000 miles. I read recently of Power Max just being changed after 30,000. Agree with the article no matter what you run they must be taken care of or will not last. Who knows how the delivery guy took care of them in 1200 miles from the factory in IN?
That's a big IF and unless you were there to check the tire pressure when the unit first rolled in at delivery you really don't know if or how the tires were abused.

Think about this...a Goodyear or Michelin tire installed on a biz jet is required to be replaced if it has one landing with a pressure found to be 20 percent low. Even worse, if the tire is 30 percent low and it's on a dual wheel/tire setup (about 90 percent of them are) then BOTH tires must be replaced. This is true even if the tires are brand new and only used one time.

Most of these tires have a normal inflation of 170-220 psi, so 20 percent is a lot of air. But, if we apply the 20 percent factor to a trailer tire rating of 65-80 psi you'll see there could be damage if the tire is operated 12-16 psi on the low side. That's a little extreme bit of caution and, unfortunately, the tire makers won't tell us the minimum limits. But, I guarantee you that if I check my tire pressure at the end of the day (I do) and find an 80 psi tire was used at 50 psi that day then it's coming off to be replaced with a new one.
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Old 02-06-2016, 12:16 AM   #6
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I had a 30 foot toy hauler and had nothing but problems with the 15' ST tires. I changed to 16" LT load rated "E" and no more problems. Luckily I had discount tire certs or I would have been broke. I would jack up each axle and look for tread wobble before every trip to the dunes. As soon as I found it I would take it back and they would remount a new tire. I never had one that lasted over a year. I never had a blowout either AND I never found an ST tire made in USA.

I run a car tire on the rear of my Goldwing too...


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Old 02-06-2016, 08:29 AM   #7
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Thanks for the post Turbs. Some good information to digest.


I know everyone wants to have safe durable tires and all problems can't be blamed on Chinese built tires. I know I've been guilty of not always watching how the extra weight I add was distributed over the axles and between the truck and trailer. It does make a difference.
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Old 02-06-2016, 08:32 AM   #8
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Light Truck tires are not always the same size, and do not always have the same load carrying capacity as ST tires. Depending on your trailer’s axle weight rating the tire load capacity might be 3420# @ 80 psi for example. The Michelin XPS RIB LT235/85R16E tire load capacity is 3,042# @ 80 psi. If you switch to LT tires for trailer applications the tire inflation pressure and/or the size of the tires would need to be capable of matching the load capacities of the trailer. If the size of the tire is increased to compensate for load capacities there needs to be sufficient clearance for the larger tires. Cost can be prohibitive too when you not only consider purchasing new tires but larger wheels for the tires to go on.
This is the paragraph that everyone who considers the switch needs to be aware of. LT tires typically have a lower carrying capacity than the equivalent ST tire. If you're doing a straight switch, you have to ensure that the new tire has enough carrying capacity for your application.

Otherwise, the fact that there are RV manufacturers that use LT tires straight from the factory should be enough to squelch any debate on the topic. Each person should use the tire that they feel most comfortable with AND has the load carrying capability for their situation.
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Old 02-06-2016, 09:51 AM   #9
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Do they really?
ST tires are load and speed rated to only 65 MPH
LT tires generally are speed and load rated at 99 MPH.
Which is better?
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Old 02-06-2016, 11:07 AM   #10
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ST tires on here are rated for 85.....
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