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Open Roads Forum  >  Tech Issues

 > Trailer Tire Speeding Rating??

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theoldwizard1

SE MI

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Posted: 01/08/20 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

Just a reminder, you CAN use LT tires on a trailer as long as the have the same or higher weight rating. (Forget the letter and ply ratings. Use the pound rating on the sidewall.) There is a much better selection of sizes and vendors of LT tires.

BFL13

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Posted: 01/08/20 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Just a reminder, you CAN use LT tires on a trailer as long as the have the same or higher weight rating. (Forget the letter and ply ratings. Use the pound rating on the sidewall.) There is a much better selection of sizes and vendors of LT tires.


Yes, but where the same size ST can carry about 1,000lbs more than the LT, include in that, "the same PSI the wheels will take".

You could have a trailer with OEM STs that take the weight, but the same size LTs at max wheel PSI can't take the weight.


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Posted: 01/08/20 07:12pm Link  |  Quote  |  Print  |  Notify Moderator

Carlisle's new ST radials are rating at 81 mph.

Terryallan

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Posted: 01/08/20 09:58pm Link  |  Quote  |  Print  |  Notify Moderator

Maxxis, Endurance, and apparently Carlisle are rated to more than 656MPH. Best to get one of those brands to ease your mind. For me. I have Maxxis. but still try to hold it under 65. Yeah. sometimes it gets it's own way and runs on up, but soon as I catch it. I slow back down.


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JIMNLIN

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Posted: 01/09/20 06:20am Link  |  Quote  |  Print  |  Notify Moderator

Quote:

Would I get anything more by going to an LT tire in the same size or assuming the rims can handle the extra pressure, moving up to a LR F or G tire? It's not my goal to fly down the road doing 80 but know 70 or so is safely doable in parts of the country where higher speeds are allowed. Trailer gross is 11,200, axles rated at 5200. My rims are the only unknown at this point.

You will gain more miles of service plus a much better hiway tire for a road trailer that sees lots of miles.
My trailer in sig weighs 11400 lb loaded for a extended stay sitting on 5200 lb axles. I use LT215/85-16 E at 2680 lbs X four = 10720 lbs.
My 11400 lb trailer has 2240 lb hitch load which leaves around 9100 lbs on the axles......or about 2300 lbs per tire. Sooo... the LT 215/85-16 E have plenty of reserve capacity. I'm getting 7 years and 52000 to 55000 miles per set at any speeds and no issues

The good old standby LT235/85-16 E at 3042 lbs capacity will give you 12168 lb capacity which is well above your trailer actual axle loads. I keep these on all my equipment trailers. Their good for any normal highway speed all day and all nite runs.

All ST or LT E tires area rated at 80 psi so your current wheels will work fine.
You don't need a 3500 lb rated tire and sure isn't any advantage of using a F or G class tire for that weight trailer (axle loads).


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twodownzero

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Posted: 01/09/20 08:49am Link  |  Quote  |  Print  |  Notify Moderator

wolfe10 wrote:

https://www.goodyear.com/en-US/tires/endurance/sizes-specs

Click on 235/80R16

Speed rating "N" is 87 MPH: https://www.tiresplus.com/tires/tire-buying-guide/tire-speed-rating/

This is not a comment one way or the other on that particular tire-- I know next to noting about trailer tires. But speed ratings are available.


This is what you want, OP.

JIMNLIN wrote:


The good old standby LT235/85-16 E at 3042 lbs capacity will give you 12168 lb capacity which is well above your trailer actual axle loads. I keep these on all my equipment trailers. Their good for any normal highway speed all day and all nite runs.


A tandem trailer that comes with 235/80R16 tires is probably not going to have sufficient axle spacing to fit the taller 235/85. If it does, going to a taller tire will gain him in weight capacity, but if he doesn't need the capacity, it very likely has no other benefit, unless his trailer needs to be taller for some reason.

I wanted to put the taller 255/85 tire on mine because my trailer is a bit nose high at ride height, but I can't because I don't have sufficient spacing, so I had to stick with the 235/85 tire.

drsteve

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Posted: 01/09/20 09:01am Link  |  Quote  |  Print  |  Notify Moderator

When you look at ST tires, you'll find that many are now rated for faster than you'd want to go. The Providers that came with my Coachmen TT are rated for 80-something.


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FrankoToo

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Posted: 01/09/20 09:47am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for everyone's response. Very much appreciated. I can now say I learned something new today. I also feel better knowing I can do what I wanted to accomplish without having to upgrade the rims on my TT at the same time. Time to go tire shopping. Happy camping all. Thanks again.


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Posted: 01/09/20 10:00am Link  |  Quote  |  Print  |  Notify Moderator

The US Made GY ENDURANCE with three years on the market has a stellar record. Discount Tire is a great place to buy.


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Posted: 01/09/20 11:39am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

OP's TT tongue wt percentage 860/6740= 13%. At GVWR 11,260, 13% is 1,463 so at GVWR, axle wt is 11,260 - 1463 = 9,797 and /4 = 2,450 per tire needed.


I'll caution people against using the bare minimum for what their tires need to carry. The /4 part can be a bit misleading depending on the rig. I know the OP's TT isn't a 16,000 lb. 42' fifth wheel, but on my old rig- I saw as much as a 500 lb. difference between my heaviest loaded tire vs. lightest loaded tire.


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