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Old 11-30-2016, 11:55 AM   #1
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Why D rated 8ply tires only have 5 plies

Not sure where this question belongs but here it is. I purchased a 225 75 R15 "D" rated tire from Amazon. The product description clearly stated that it was an 8 ply tire. Didn't think to check the little letters on the side wall until after I had the tire mounted but on the side wall it states that it is D rated and has 5 plys not 8. Amazon gave me a full credit since the product was incorrectly described and allowed me to keep the tire since I had already paid to have it mounted. PS they are still offering the same tire with the same 8 ply description. Didn't think anything more about it until I had a blow out on a recent trip and bought a replacement Goodyear Marathon at Walmart. It is a D rated tire and also a 5 ply tire.

Are all D rated tires 5 ply?
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Old 11-30-2016, 12:05 PM   #2
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Answered my own question. Per an article on Tire Rack website, the load rating on an ST tire is defined either by an initial [IE D] or # of plys [IE 8]. So D rated ST tires are all described as 8 ply even though they only have 5 plies.

Not sure how this makes sense but that's the way they do it.
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Old 12-01-2016, 09:14 PM   #3
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I always thought the ply rating came from the old days of bias ply tires. Radials have less plys for a given load rating vs bias ply tires. I could be wrong.
I'm guessing your tires have 5 ply tread and 2 ply sidewall? That's still not 8 ply.
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Old 12-01-2016, 09:43 PM   #4
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We put on Michelin E rated tires, which showed they had 8 plys.
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Old 12-02-2016, 07:36 AM   #5
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Originally Posted by wwt View Post
I always thought the ply rating came from the old days of bias ply tires. Radials have less plys for a given load rating vs bias ply tires. I could be wrong.
I'm guessing your tires have 5 ply tread and 2 ply sidewall? That's still not 8 ply.

That's pretty much what the article on Tire Rack said, except that the ply count is still used to describe many D rated st tires including the Goodyear Marathon that is in reality only a 5 ply. The descriptions that use the 8 ply in their name may have something to do with being foreign made?
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Old 12-02-2016, 07:48 AM   #6
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Originally Posted by The Logans View Post
We put on Michelin E rated tires, which showed they had 8 plys.
Not saying you are mistaken, but will you state the specifics [name/size/ load rating] and then look on the sidewall on the tire and see what it says concerning how many plies. The reason I am asking is that the info that I have found is that as far as ST tires are concerned, 8 ply and D rated are the same. I thought I was buying 8ply tires and both brands I bought [described as 8 ply] clearly show they have 5 plies on the sidewall.
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Old 12-02-2016, 08:17 AM   #7
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I must admit I"m a little confused with this as well. I have 4 new unmounted e-rated ST tires in the 225x75x15 size sitting in the garage waiting for installation. I just went out and read the sidewall and it states "Tread 6 plies: 3 plies polyester, 2 steel, 1 nylon. Sidewall: 3 plies polyester." The description when purchased was 225x75x15 LRE 10ply.
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Old 12-02-2016, 10:10 AM   #8
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Just when I thought I knew a lot about tires.... This forum is great for helping me learn more.

Anyway, this got me thinking. Whats the difference between an "ST" tire and a "LT" tire.

For where I am at we have two sets of rims for every vehicle at our household. 1 set with summer tires, and 1 set with winter 'studded' tires (a very common practice here). So I went and checked both sets of tires for my truck. Both sets are LT265/70R17, Load range E and both clearly state 10ply.
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Old 12-02-2016, 11:08 AM   #9
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It's a RATING that, as said above comes from the olden days. It actually does kind of imply that there that many plies, but since it's a rating it doesn't legally have to have that many plies. It just has to meet the qualifications of the rating. So... you got a free tire out of the deal... be happy. It would be easier for everyone if they'd do away with a ply rating and just do the load range thing.
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Old 12-02-2016, 11:51 AM   #10
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Originally Posted by NVGun40 View Post
Anyway, this got me thinking. Whats the difference between an "ST" tire and a "LT" tire.
In decreasing carrying capacity, and increasing comfort the 3 main classifications we would need to know are:

ST= Special Trailer
LT= Light Truck
P=Passenger Vehicle (Car or Truck)
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Old 12-02-2016, 11:54 AM   #11
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Quote:
Originally Posted by The Logans View Post
We put on Michelin E rated tires, which showed they had 8 plys.
Interesting...cuz E rated tires are supposed to have 10 plys (plies?) but the sidewall shows 7 on mine (not Michelins).
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Old 12-02-2016, 11:57 AM   #12
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Quote:
Originally Posted by NVGun40 View Post
Just when I thought I knew a lot about tires.... This forum is great for helping me learn more.

Anyway, this got me thinking. Whats the difference between an "ST" tire and a "LT" tire.

For where I am at we have two sets of rims for every vehicle at our household. 1 set with summer tires, and 1 set with winter 'studded' tires (a very common practice here). So I went and checked both sets of tires for my truck. Both sets are LT265/70R17, Load range E and both clearly state 10ply.
8ply and D are the same weight rating
10ply and E are the next higher weight rating

Neither tire has the actual number of plies stated
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Old 12-02-2016, 12:12 PM   #13
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Quote:
Originally Posted by bankr63 View Post
In decreasing carrying capacity, and increasing comfort the 3 main classifications we would need to know are:

ST= Special Trailer
LT= Light Truck
P=Passenger Vehicle (Car or Truck)
Thank you. As I said, I thought I knew a lot about tires... I can decipher load ratings, and tire sizes and even know the bonding processes for different plys and many of the why's and hows of tread cut and what to look for in consideration of differing terrain and road conditions. I knew the LT is a Light Truck and I knew the P is Passenger car. I had just never paid attention to ST as a Special Trailer tire since I have never purchased them. On every trailer I have owned, I have always changed rims and put on LT tires.
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Old 12-03-2016, 09:35 AM   #14
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I came across this in the RV Travel news letter and thought it might fit well in here

RV Tech Tips
from Mark Polk
Tire strength
Tires and load range designations on tires have changed over the years. It used to be a 6-ply or 8-ply tire, and you knew the higher the number the stronger the tire. Now they use a letter to designate load range and tire strength. To help simplify this you can take the letter for the load range on the tire, determine what number it represents in the alphabet, and multiply that by two, to determine the strength of the tire. It sounds much more difficult than it is. If your tire is a load range “D” that is the fourth letter in the alphabet. 4 X 2 equals 8 so a load range “D” tire is equivalent to an 8-ply tire in strength.
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