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 > 245/75/R16 or 235/85/R16?

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slomark

San Luis Obispo, CA

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Posted: 02/09/12 09:17pm Link  |  Quote  |  Print  |  Notify Moderator

The taller sidewall of the 235 might have a greater load capacity.

christopherglenn

a little over an hour from Yosemite

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Posted: 02/09/12 10:45pm Link  |  Quote  |  Print  |  Notify Moderator

The higher loading on the 235's is because they are ST, not LT tires.
you are in 265/75/16 to have the loading of the 235 ST tire.


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ExRocketScientist

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Posted: 02/10/12 04:52am Link  |  Quote  |  Print  |  Notify Moderator

christopherglenn wrote:

The higher loading on the 235's is because they are ST, not LT tires.
you are in 265/75/16 to have the loading of the 235 ST tire.

Both of the tires the OP is considering are LT tires and have the same load rating.


ERS

christopherglenn

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Posted: 02/11/12 09:02pm Link  |  Quote  |  Print  |  Notify Moderator

ExRocketScientist wrote:

christopherglenn wrote:

The higher loading on the 235's is because they are ST, not LT tires.
you are in 265/75/16 to have the loading of the 235 ST tire.

Both of the tires the OP is considering are LT tires and have the same load rating.


They are?

cruz-in wrote:

Hi All,

Soon I will be replacing the ST tires on my 5th wheel with LT tires. The ST tires are 235/80/R16 Load Range E and the Max weight of the 5th wheel is just under 10K pounds. My question is: "Is there any advantage to using a 245/75/R16 or 235/85/R16?"

Thanks


ExRocketScientist

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Posted: 02/12/12 04:54am Link  |  Quote  |  Print  |  Notify Moderator

christopherglenn wrote:

ExRocketScientist wrote:

christopherglenn wrote:

The higher loading on the 235's is because they are ST, not LT tires.
you are in 265/75/16 to have the loading of the 235 ST tire.

Both of the tires the OP is considering are LT tires and have the same load rating.


They are?

cruz-in wrote:

Hi All,

Soon I will be replacing the ST tires on my 5th wheel with LT tires. The ST tires are 235/80/R16 Load Range E and the Max weight of the 5th wheel is just under 10K pounds. My question is: "Is there any advantage to using a 245/75/R16 or 235/85/R16?"

Thanks

"Soon I will be replacing the ST tires on my 5th wheel with LT tires". That's where I got that from. To the OP -- am I misinterpreting something?

christopherglenn

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Posted: 02/12/12 09:59am Link  |  Quote  |  Print  |  Notify Moderator

both tires are not LT tires, the old ones are ST. I have not found LT tires with the same load rating as ST tires in the same size. The 245 LT tires are rated ~300 lbs lower then the 235 ST tires. If someone found 245 Lt tires in the same ~3400lb rating as the 235 ST tires it is news to me, all I found was 265 LT tires to have the same loading at the 235 ST.

ExRocketScientist

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Posted: 02/12/12 11:00am Link  |  Quote  |  Print  |  Notify Moderator

christopherglenn wrote:

both tires are not LT tires, the old ones are ST. I have not found LT tires with the same load rating as ST tires in the same size. The 245 LT tires are rated ~300 lbs lower then the 235 ST tires. If someone found 245 Lt tires in the same ~3400lb rating as the 235 ST tires it is news to me, all I found was 265 LT tires to have the same loading at the 235 ST.

Are you the OP?

No you won't find LT tires with the same ratings as ST tires. But when replacing tires, be careful about replacing them with tires that have a lower load rating. In most instances, you want to go the other way.

My read of the OP is that they want to replace an ST (most likely a 15") with one of the 16" LTs rated at 3042 pounds (I did the same thing last May) and was looking to see if there was an advantage of the 245 over a 235 or vice versa. If I didn't interpret that correctly, perhaps the OP could come back and be a little more specific.

In reading responses from Chris and Old Greaser, they interpret the OP the way I did.

christopherglenn

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Posted: 02/12/12 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

ExRocketScientist wrote:

christopherglenn wrote:

both tires are not LT tires, the old ones are ST. I have not found LT tires with the same load rating as ST tires in the same size. The 245 LT tires are rated ~300 lbs lower then the 235 ST tires. If someone found 245 Lt tires in the same ~3400lb rating as the 235 ST tires it is news to me, all I found was 265 LT tires to have the same loading at the 235 ST.

Are you the OP?

No you won't find LT tires with the same ratings as ST tires. But when replacing tires, be careful about replacing them with tires that have a lower load rating. In most instances, you want to go the other way.

My read of the OP is that they want to replace an ST (most likely a 15") with one of the 16" LTs rated at 3042 pounds (I did the same thing last May) and was looking to see if there was an advantage of the 245 over a 235 or vice versa. If I didn't interpret that correctly, perhaps the OP could come back and be a little more specific.

In reading responses from Chris and Old Greaser, they interpret the OP the way I did.


Read the original post. "The ST tires are 235/80/R16 Load Range E and the Max weight of the 5th wheel is just under 10K pounds. "

The 235/85/16 ST tires are likely rated to 3400 lbs each, 235/85/16 LT tires are ~2100-2300 each, 245/75/16E LT tires are rated to 3169lbs.

My point is going from a ST to a LT tire you will be WAY overloaded on the tires. even going up a size (in tread width), you are loosing 200-300 lbs a tire. 4 tires rated to 3100+ each are fine for a 10k trailer (The OP's Trailer). A 12k trailer would be a little close for comfort. 13,600 in 235/85/16E ST vs 12,676 245/75/16E LT ~9200 235/85/16E LT.

Chris

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Posted: 02/12/12 10:02pm Link  |  Quote  |  Print  |  Notify Moderator

christopherglenn wrote:

ExRocketScientist wrote:

christopherglenn wrote:

both tires are not LT tires, the old ones are ST. I have not found LT tires with the same load rating as ST tires in the same size. The 245 LT tires are rated ~300 lbs lower then the 235 ST tires. If someone found 245 Lt tires in the same ~3400lb rating as the 235 ST tires it is news to me, all I found was 265 LT tires to have the same loading at the 235 ST.

Are you the OP?

No you won't find LT tires with the same ratings as ST tires. But when replacing tires, be careful about replacing them with tires that have a lower load rating. In most instances, you want to go the other way.

My read of the OP is that they want to replace an ST (most likely a 15") with one of the 16" LTs rated at 3042 pounds (I did the same thing last May) and was looking to see if there was an advantage of the 245 over a 235 or vice versa. If I didn't interpret that correctly, perhaps the OP could come back and be a little more specific.

In reading responses from Chris and Old Greaser, they interpret the OP the way I did.


Read the original post. "The ST tires are 235/80/R16 Load Range E and the Max weight of the 5th wheel is just under 10K pounds. "

The 235/85/16 ST tires are likely rated to 3400 lbs each, 235/85/16 LT tires are ~2100-2300 each, 245/75/16E LT tires are rated to 3169lbs.

My point is going from a ST to a LT tire you will be WAY overloaded on the tires. even going up a size (in tread width), you are loosing 200-300 lbs a tire. 4 tires rated to 3100+ each are fine for a 10k trailer (The OP's Trailer). A 12k trailer would be a little close for comfort. 13,600 in 235/85/16E ST vs 12,676 245/75/16E LT ~9200 235/85/16E LT.


Man you are all over the place. You need to look at a tire site.

Both LT235/85R16 LRE AND LT 245/75R16 LRE'S are rated to 3042 at 80 lbs inflation and follow industry standard weight standards. Most are built much better than cheap ST tires that have inflated weight ratings based on speed restrictions and lower testing standards. Chris


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ExRocketScientist

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Posted: 02/13/12 05:30am Link  |  Quote  |  Print  |  Notify Moderator

christopherglenn wrote:

ExRocketScientist wrote:

christopherglenn wrote:

both tires are not LT tires, the old ones are ST. I have not found LT tires with the same load rating as ST tires in the same size. The 245 LT tires are rated ~300 lbs lower then the 235 ST tires. If someone found 245 Lt tires in the same ~3400lb rating as the 235 ST tires it is news to me, all I found was 265 LT tires to have the same loading at the 235 ST.

Are you the OP?

No you won't find LT tires with the same ratings as ST tires. But when replacing tires, be careful about replacing them with tires that have a lower load rating. In most instances, you want to go the other way.

My read of the OP is that they want to replace an ST (most likely a 15") with one of the 16" LTs rated at 3042 pounds (I did the same thing last May) and was looking to see if there was an advantage of the 245 over a 235 or vice versa. If I didn't interpret that correctly, perhaps the OP could come back and be a little more specific.

In reading responses from Chris and Old Greaser, they interpret the OP the way I did.


Read the original post. "The ST tires are 235/80/R16 Load Range E and the Max weight of the 5th wheel is just under 10K pounds. "

The 235/85/16 ST tires are likely rated to 3400 lbs each, 235/85/16 LT tires are ~2100-2300 each, 245/75/16E LT tires are rated to 3169lbs.

My point is going from a ST to a LT tire you will be WAY overloaded on the tires. even going up a size (in tread width), you are loosing 200-300 lbs a tire. 4 tires rated to 3100+ each are fine for a 10k trailer (The OP's Trailer). A 12k trailer would be a little close for comfort. 13,600 in 235/85/16E ST vs 12,676 245/75/16E LT ~9200 235/85/16E LT.

Your observations are right on point. One of the problems with this thread is there is some vital information missing, because the OP has already made one decision -- to replace the ST tires with one of two different LT tires, and is just asking which LT tire. What we don't know is the GAWR on the OP's trailer. This would determine how "foolhardy" it is to replace a higher rated ST tire with a lower rated LT tire. But this may fall into the problem child axle area. See the problem is there is an ST tire rated at 3K which is technically adequate for a 6K axle. But until recently, it just wasn't available. So what a lot of manufacturers did was to install the higher rated Load range E tire. So if you replace this with the lower rated LT tire (at 3042 pounds each), you have technically done a no-no, and at the same time have put barely enough tire on to technically meet the GAWR. Many people get away with this. Based on the OP's comment about the max weight being just under 10K, it would be reasonable to expect the OP to get away with this. The OP is probably running the tires at 2150 each. The 3042s would give almost 900 lb extra capacity per tire.

Then again, we don't even know if the 16" ST tire is OEM. It is possible that somebody decided at some point to do an upgrade from 15" wheels to 16" wheels and use the ST tires. I came close to doing that myself. I had already decided to upgrade to 16" wheels but was torn between an ST tire rated at 3420 or the LT tire rated at 3042. I finally put the LTs on last May. The reason you see me in these tire threads is because I spent a year reading tire threads in order to make my final decision; that is how difficult it was. I guess once I waded into the issues, I sort of developed an addiction ("hello, my name is David, and I am addicted to ST/LT tire issues" -- LOL).

But we will never know . . . the OP is long gone on this one.

* This post was edited 02/13/12 05:36am by ExRocketScientist *

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