6 Ply ag tires verses 8 Ply ag tires ?

[coobie]

It wont blow. Just take it fairly easy and it'll be alright.

Famous last words.LOL.Is that like hold my beer and watch this?

 

[SPYDERLK]

Famous last words.LOL.Is that like hold my beer and watch this?

As long as the container is not damaged it will be ok.

 

[Midniteoyl]

Famous last words.LOL.Is that like hold my beer and watch this?

LOL.. Pretty much

 

[Midniteoyl]

See attached. Pages 40-42 and 53 are relevant including the notes on page 42 particularly Note 1.

http://www.titanstore.com/pdf/LoadandInflation.pdf

More plies means more load capacity due to the increased inflation allowed.

True back in the day as well as now-a-days.

(sigh).. So, just how many 'plys' do think is in an 8 ply tire? 8? No..

Tires are no longer made with a 'ply count'. It use to be they were actually 2 plys, or 4, or 6 to 16. Now a days, there are 1-3 'plys' and the actual strength of those ply plus rubber thickness and bead strength determine how much air you can put in it. Notice on a load chart that the same size tire has many PSI ratings? Notice how the higher the PSI the higher the load? The higher PSI is necessary to actually carry the higher load. The higher 'ply rating' is simply a measuring system that shows you how much PSI the tire can hold. See the 'Load Index'? Thats what we use now. See the figures in BOLD on the chart? That is the max PSI, and thus load, for that rating of tire. At 18PSI ALL of the 9.5R24 tires will only handle 1520lbs, regardless of 'plys' or 'stars'. If you take the one star (95 Index) and put 24PSI in it, it will hold the 1820lbs of a 2 star (101 Index). Albeit for short periods and you need to reduce your max speed (you did notice that too, right). Also notice that a larger tire will hold more weight for a given PSI...


Oh,you gave me a radial tire chart, but Bias Ply principles are the same. Just built a little different..

 

[Midniteoyl]

Only because it can hold more air. In a road going tire, it is also because it is tougher and can handle more heat at speed due to weight and deflection.

In todays tires, there really is no more 'plys'. A 'ply rating' is simply a way to show how much air, and thus weight, a tire can hold.

Ply ratings are as common as dirt on bias ply tires and do nothing to show acceptable inflation rates. Inflation data do that.
Radial tires use load rating scales or star ratings. Mentioned. Bias ply tires still use ply ratings for the most part. All directly relate to the tire's basic construction. If you disagree, better do some reading. Over-inflating a tire with a low load rating does not increase the load rating of the tire beyond a modest amount. That is the direction much of the discussion here is heading, and it does the OP a disservice.

See attached. Pages 40-42 and 53 are relevant including the notes on page 42 particularly Note 1.

http://www.titanstore.com/pdf/LoadandInflation.pdf

More plies means more load capacity due to the increased inflation allowed.

True back in the day as well as now-a-days.

(sigh).. So, just how many 'plys' do think is in an 8 ply tire? 8? No..

Tires are no longer made with a 'ply count'. It use to be they were actually 2 plys, or 4, or 6 to 16. Now a days, there are 1-3 'plys' and the actual strength of those ply plus rubber thickness and bead strength determine how much air you can put in it. Notice on a load chart that the same size tire has many PSI ratings? Notice how the higher the PSI the higher the load? The higher PSI is necessary to actually carry the higher load. The higher 'ply rating' is simply a measuring system that shows you how much PSI the tire can hold. See the 'Load Index'? Thats what we use now. See the figures in BOLD on the chart? That is the max PSI, and thus load, for that rating of tire. At 18PSI ALL of the 9.5R24 tires will only handle 1520lbs, regardless of 'plys' or 'stars'. If you take the one star (95 Index) and put 24PSI in it, it will hold the 1820lbs of a 2 star (101 Index). Albeit for short periods and you need to reduce your max speed (you did notice that too, right). Also notice that a larger tire will hold more weight for a given PSI...


Oh,you gave me a radial tire chart, but Bias Ply principles are the same. Just built a little different..

Besides your first quote, I do believe we are basically saying the same thing.. A higher 'ply rating' equals more PSI which equals more load. Correct?

 

[RickB]

Besides your first quote, I do believe we are basically saying the same thing.. A higher 'ply rating' equals more PSI which equals more load. Correct?

A higher ply count does not equal higher inflation pressures.
A higher ply count ALLOWS higher inflation pressures; the combination yields more load carrying capacity.
Lower ply ratings REQUIRE lower inflation pressures for safe operation.
A fairly basic set of facts that have been true since before Harry Firestone died.
Glad you finally found the specific pages I called out for you listing bias tires that still use ply ratings.

 

[hophornbeam]

coobie, not sure if your question got answered, but I will pass on my experience. Many years ago I had and 1120JD with 145 loader. I don't recall the ply rating of the front tires. I typically ran them at 45psi upon advice of tire suppliers, because it had a loader. I would break a front spindle/axle about once a year. I also had a loader mounted 7' stone fork. I finally asked the JD dealer what was causing this problem. His reply - what pressure are you running in the tires? When I said 45psi he said let some air out!! Tires are cheaper than front spindles!! so I backed off to 35 psi. I did not blow any tires or break any more spindles. The point is, if the tires don't flex, you pass the shock to the next weakest point. As I said, just my experience.

 

[coobie]

coobie, not sure if your question got answered, but I will pass on my experience. Many years ago I had and 1120JD with 145 loader. I don't recall the ply rating of the front tires. I typically ran them at 45psi upon advice of tire suppliers, because it had a loader. I would break a front spindle/axle about once a year. I also had a loader mounted 7' stone fork. I finally asked the JD dealer what was causing this problem. His reply - what pressure are you running in the tires? When I said 45psi he said let some air out!! Tires are cheaper than front spindles!! so I backed off to 35 psi. I did not blow any tires or break any more spindles. The point is, if the tires don't flex, you pass the shock to the next weakest point. As I said, just my experience.

Good info,thanks.coobie

 

[RickB]

coobie, not sure if your question got answered, but I will pass on my experience. Many years ago I had and 1120JD with 145 loader. I don't recall the ply rating of the front tires. I typically ran them at 45psi upon advice of tire suppliers, because it had a loader. I would break a front spindle/axle about once a year. I also had a loader mounted 7' stone fork. I finally asked the JD dealer what was causing this problem. His reply - what pressure are you running in the tires? When I said 45psi he said let some air out!! Tires are cheaper than front spindles!! so I backed off to 35 psi. I did not blow any tires or break any more spindles. The point is, if the tires don't flex, you pass the shock to the next weakest point. As I said, just my experience.

That's very good info that also relates to the question about foam filling.

 

[Midniteoyl]

A higher ply count does not equal higher inflation pressures.
A higher ply count ALLOWS higher inflation pressures; the combination yields more load carrying capacity.
Lower ply ratings REQUIRE lower inflation pressures for safe operation.
A fairly basic set of facts that have been true since before Harry Firestone died.
Glad you finally found the specific pages I called out for you listing bias tires that still use ply ratings.

I guess we are close enough. I still say its the air that carries the weight. A higher rating only allows you to have more safely.. You can put more PSI in a lower rated tire and carry more load. Its not 'marginally more'.

Maximum Load

A tire's maximum load is the most weight the tire is designed to carry. Since a tire's load carrying capacity is related to the tire's size and how much inflation pressure is actually used, maximum loads are rated with the tire inflated to an industry assigned inflation pressure.

Additionally, load ranges are used to separate tires that share the same physical size, but differ in strength due to their internal construction. "Higher" load ranges are used to identify tires that have a stronger internal construction, and therefore can hold more air pressure and carry more weight.

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=195

How can a tire carry such a heavy load?

Remember, it's not the tire that carries the load, but the air inside. The tire is only the container. And, inflation pressure does not change with load. If the tire had 100 psi-jacked up in the air-it will still have 100 psi when you lower it to the ground.

http://www.bridgestonetrucktires.com/us_eng/real/magazines/98v3issue4/v3i4Tech.asp <------ Please Read this article!

Back when Firestone was alive, they DID use actual 'plys' and the tires DID carry some of the weight by themselves and the air added to the load capacity, kept the tire round, and added cushion. Nowadays, that is not the case and the tire itself can carry no weight and the air does all the lifting. So, saying that if you take a one star and adding more air than max will not increase its weight carrying capacity is wrong. So is saying using a higher ply rating with less PSI will give you more capacity than a lower ply rating at the same PSI. They will both give you the same capacity 'cause you are at the same PSI.

Other than that one little thing, we are close.