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Old 03-15-2016, 03:26 PM   #1
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Upgrade to a LT235/85/16 Tire from a ST235/80/16 Tire

Does anyone know if the Goodyear or Michelin light truck tire dimensions LT235/85R16 will work on a 2014 Blue Ridge 3600RS and what difference the tire will make (besides elimination of blowouts)? The upgrade to this LT tire will change the tire ratio from 80 to 85.

The tires currently on our RV is ST235/80/16. We use a 2015 Chevy 3500 duly to pull our trailer with a B&W companion hitch. We have a ONEN 5500 power plant.

I called Blue Ridge for information. I did not receive a definitive answer about changing the trailer tire size since all he could recommend as a company representative is what is printed on the RV (ST235/80R16). However, he did say he thought changing the ratio size from 80 to 85 should be OK but it will change how the trailer rides and he recommended I look on the internet to learn about the ratio change. He did not say putting the LT tire on the trailer was OK but he did say an option on the Cardinal RV is a light truck tire.

We appreciate any information you have on changing the tires even if it is to a different brand.
We are looking for a way to prevent tire blow outs and getting better wear on our tires.
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Old 03-15-2016, 06:10 PM   #2
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I have no idea about your actual question. BUT- given that your last sentence is that you're hoping to prevent blowouts...

Do you know how much you're carrying on the tires? Often times LT tires have less carrying capacity than equivalent ST tires. Which means, you could end up unknowingly be overloading the LT tires.

I personally wouldn't use tires with less carrying capacity than what it came with. AND- I've learned that not even the manufacturers get that right; my tires didn't have carrying capacity for the axles (6,840 lbs. of tire carrying capacity on 7,000 lbs. axles).
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Old 03-16-2016, 08:04 AM   #3
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I use the 235/85-16 Firestone Transforce HT.Commercial grade LT tire. More capacity then our previous 235/80-16 China bombs.they ride about 1/2 inch taller but everything is better. Also, having a 4x4 truck, the slightly taller tire helps level out the fiver better.

I've used these tire for 3 of my trailers over the years and never had any issues.
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Old 03-16-2016, 02:08 PM   #4
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We had the good year marathon tires 235/80/16 (30.8" diameter) on our Cardinal until one of the tires had separated on the inside. We only caught it because we pulled them off to repack the bearings. After much research we went with the Michelin XPS Rib 235/85/16 (31.7" diameter). Prior to installing the new tires I was able to slide the metal Bal chock (closed as much as possible) between the tires. It was a snug fit but it did fit. After the XPS ribs were installed the gap was too small for the chock. I have just under 2 inches gap between the tires now. Before I had right around 3 inches gap. I had concerns but after asking the folks on this forum, the consensus was to not worry about it. I've taken many trips since and have not had an issue. And since I have the auto leveling I just put a chock behind the tires that would prevent it from rolling. The max load on each tire is 3042lbs I believe. The marathons were rated higher, but with all of the issues with those tires I believe that number is greatly exaggerated. Just my opinion. Now I have piece of mind when towing. Jerry


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Old 03-16-2016, 02:24 PM   #5
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You can also change to I believe it is 245 75R16 which is slitely shorter diameter.
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Old 03-16-2016, 08:42 PM   #6
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Quote:
Originally Posted by ependydad View Post
Often times LT tires have less carrying capacity than equivalent ST tires. Which means, you could end up unknowingly be overloading the LT tires.
I'll echo what ependydad said. As a rule, ST tires have a higher load capability than the same size LT.
My setup is a good example. My Chaparral has the ST235 80 16 E on it. The side wall says @80 psi- Max load is 3520. I have the Firestone Transforce HT tires on my truck. The size you are looking at, LT235 85 16 E is rated with a Max load of 3042. Link That's nearly 1000 lbs difference. My 5er weighs 12,500 before I put anything in it. The GVWR is 14,500. If I load it up, the pin weight is about 2400 lbs. If I do the math right, that still leaves over 12,000 on the trailer axles. The LT tire would be completely maxed out. (3042 X 4= 12,168) I'm not comfortable with that.

I completely agree the recent Marathons are garbage, but I would still go with an ST over an LT unless the LT was a F or G load range. But then you'll need to check your wheels to make sure they can handle the additional air pressure.

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Old 03-16-2016, 08:49 PM   #7
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look into the sailun s637 st235/85/R16 load range G's. More than enough tire for that trailer and should fit just fine and probably about the best price you will find on any (a guess, haven't compared lately). Rims should be fine but just check them for the 110psi stamping as that size LR G will call for the 110psi inflation. Good luck
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Old 03-16-2016, 10:02 PM   #8
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If increasing a load range, ensure that the outer diameter of the tire isn't going to cause you issues as Jerry01 mentioned - with my trailer, the space between the tires was less than 2". I couldn't increase the outer diameter of my tire whatsoever and have to find alternatives that fit within that parameter.
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Old 03-16-2016, 10:21 PM   #9
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Trying not to get into a lengthy discussion on LT's vs ST's, but LT's are manufactured with a higher built in safety factory for carrying capacity ... ST's are rated nearly flat out for carrying capacity. Similar to Jerry01, I ditched my ST235 80R16 Marabombs and went with Michelin LTX MS/2 E range tires (LT235 85R16) on my last two fivers with no worries. They were a bit over an inch larger in diameter, but posed no issue. It's sooooo nice to get to a campground without seeing bulges or knots in the tires.
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Old 03-16-2016, 10:30 PM   #10
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Quote:
Originally Posted by dieselguy View Post
Trying not to get into a lengthy discussion on LT's vs ST's, but LT's are manufactured with a higher built in safety factory for carrying capacity ... ST's are rated nearly flat out for carrying capacity. Similar to Jerry01, I ditched my ST235 80R16 Marabombs and went with Michelin LTX MS/2 E range tires (LT235 85R16) on my last two fivers with no worries. They were a bit over an inch larger in diameter, but posed no issue. It's sooooo nice to get to a campground without seeing bulges or knots in the tires.
^^^

Yep.

Obviously he would get the correct load rated tire but an LT is a much safer, more reliable route then any china bomb ST tire iMHO.

I run the 235/85-16 and I only have 10K over tires with a 12,168 max load so no worries. I have used LT tires with zero issues for years. All the ST tires we have used have blown for some reason or another. CRAP...

The ONLY 16 inch ST rated tire worth a damn is a Goodyear G614 but they are $$$$.
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