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Old 06-12-2019, 02:32 PM   #1
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ST to LT tires?

Did a search on past posts concerning using LT tires on TT/5er's and left me a little confused.

Just back from month long trip in our TT. Along the way we had 2 blow outs, both on the same side and of course there was some damage. Not sure why the tires blew...they were American made Hercules tires (ST225/15/R75, Load range E) just over a year old. Supposedly very good tires.

At one of our stops I was talking to a mobile RV repairmen about tires and he recommended using LT tires over the ST tires.

So....
1. Is using LT tires ok?

2.Are they actually better than ST's?

3. What is the difference between a LT and ST tire?

4. Doing some research, I see where LT tires usually have a max PSI of around 50 while E rated ST's are 80 PSI. Is that an issue there.

5. I am assuming others have already done this change? Good or bad...any issues?

6. Can use the same rim as long as they are the same size tire?

7. What ever I am missing...

Thanks.
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Old 06-12-2019, 02:39 PM   #2
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Indepth information to your question
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Old 06-12-2019, 02:50 PM   #3
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Thanks...Very good info!
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Old 06-12-2019, 02:51 PM   #4
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In your size LT tires will be sorely limited and possibly not have the load carrying capacity you need. Bettermoption will be GoodYear Endurance. They are currently the top of the pile for ST tires.
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Old 06-12-2019, 03:00 PM   #5
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In your size LT tires will be sorely limited and possibly not have the load carrying capacity you need. Bettermoption will be GoodYear Endurance. They are currently the top of the pile for ST tires.
I have already talked to the dealer who sold me the Hercules tires. He is very surprised that it happened. He asked me to bring back the old blown tires so he can inspect them and see if he can get any warranty from the manufacturer.

I have used these tires in the past with no issues; maybe a bad tire/lot, or just my luck.

I keep the tires at 75 PSI.
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Old 06-12-2019, 03:02 PM   #6
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I have an extra spare rim...decided to start carrying 2 spares. Any others do that?
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Old 06-12-2019, 03:23 PM   #7
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We donít. We did carry a spare tire, just the tire, on our trip to Alaska last year, in addition to the mounted spare we normally carry, just in case. We didnít need either but I was advised that getting a tire mounted most places is pretty easy but the chances of them having a tire in your size can be much more challenging and expensive.
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Old 06-12-2019, 03:24 PM   #8
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If you are running the tires near max weight you should run them at max pressure. It should be the same listed in your RV paperwork or tire stickers.
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Old 06-12-2019, 03:25 PM   #9
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I have an extra spare rim...decided to start carrying 2 spares. Any others do that?

I did one year when I had 2 damaged tires in a single day. One was a blowout.
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Old 06-12-2019, 03:26 PM   #10
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We donít. We did carry a spare tire, just the tire, on our trip to Alaska last year, in addition to the mounted spare we normally carry, just in case. We didnít need either but I was advised that getting a tire mounted most places is pretty easy but the chances of them having a tire in your size can be much more challenging and expensive.
Good point. I did have to buy 2 new tires.
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Old 06-12-2019, 03:29 PM   #11
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If you are running the tires near max weight you should run them at max pressure. It should be the same listed in your RV paperwork or tire stickers.
My original tires were Load D...which I kept at 65 psi, which is what was recommended on the TT.

The tires I have now are load E, which has a max of 80 psi at cold. I figured I was safe running at 75.
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Old 06-12-2019, 03:31 PM   #12
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What speed were you running and what speed do you normally tow?
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Old 06-12-2019, 03:32 PM   #13
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I did one year when I had 2 damaged tires in a single day. One was a blowout.
Sounds like a day I had over a year ago...tire blew out, put on spare and spare blew about 20 miles down the road. That should have been the omen to start carrying 2 spares.
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Old 06-12-2019, 03:34 PM   #14
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What speed were you running and what speed do you normally tow?
First tire went at 62 mph...my normal cruising speed. Second one went around 45-55 mph.
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