fifth wheel tires

[smarty]

Need to replace tires on my 38' fifthwheel that weighs 18,000 lbs
Tires that came with rig are five ply
I got a great deal on 12 ply tires
Any reason for not upgrading to 12 ply tires?

[CALandLIN]

JIMNLIN wrote:

You should better describe a five ply tire. Is that three belt plies and two sidewall plys?

In today's tire industry, ST & LT tires load capacities are defined by a single load range letter following a tire service description or written out on the tire sidewall like this, LRD. A LRD tire would be equal to an 8 ply tire in the old ply rating system.

Yeah....the tire industry still uses ply rated or ply rating sometimes written as a PR in their brochures/website adds.

The OP probably reading the tires actual number of plies that go like this for just about all our high capacity LT and ST tires...
2 body plies (poly or steel)...
2 steel tread plies
1 ply under the tread plies usually nylon.

My post that you have taken upon yourself to correct into your wording that is equal to mine in another descriptive method is moot.

We still don't have an accurate description of the tires smarty is trying to describe. There isn't much to comment about with his description because it doesn't lead is to a load range or a descriptive tire size.

[CALandLIN]

eHoefler wrote:
http://roadmastertires.com/getmedia/b6ee23c2-4f5f-4536-9468-b76d751ddaad/RM170.aspx

I run J-rated 17.5's on ours with the correct wheel rated at 125 psi and 6005 pounds each. I have had these now for 3 years and I cannot find anything to complain about this combonation. It was $5.00 more to buy the tire and wheel than just buying new 16" tires.

Did you know the 6005# load capacity LRJ tires in your reference above also have a speed letter "J" = 62 MPG?

[JIMNLIN]

You should better describe a five ply tire. Is that three belt plies and two sidewall plys?

In today's tire industry, ST & LT tires load capacities are defined by a single load range letter following a tire service description or written out on the tire sidewall like this, LRD. A LRD tire would be equal to an 8 ply tire in the old ply rating system.

Yeah....the tire industry still uses ply rated or ply rating sometimes written as a PR in their brochures/website adds.

The OP probably reading the tires actual number of plies that go like this for just about all our high capacity LT and ST tires...
2 body plies (poly or steel)...
2 steel tread plies
1 ply under the tread plies usually nylon.

[fj12ryder]

eHoefler wrote:
http://roadmastertires.com/getmedia/b6ee23c2-4f5f-4536-9468-b76d751ddaad/RM170.aspx

I run J-rated 17.5's on ours with the correct wheel rated at 125 psi and 6005 pounds each. I have had these now for 3 years and I cannot find anything to complain about this combonation. It was $5.00 more to buy the tire and wheel than just buying new 16" tires.

$155 for a wheel and tire is one heck of a deal in any size.

[memtb]

eHoefler wrote:
http://roadmastertires.com/getmedia/b6ee23c2-4f5f-4536-9468-b76d751ddaad/RM170.aspx

I run J-rated 17.5's on ours with the correct wheel rated at 125 psi and 6005 pounds each. I have had these now for 3 years and I cannot find anything to complain about this combonation. It was $5.00 more to buy the tire and wheel than just buying new 16" tires.

We love our H - rated Continental’s as well!

[eHoefler]

http://roadmastertires.com/getmedia/b6ee23c2-4f5f-4536-9468-b76d751ddaad/RM170.aspx

I run J-rated 17.5's on ours with the correct wheel rated at 125 psi and 6005 pounds each. I have had these now for 3 years and I cannot find anything to complain about this combonation. It was $5.00 more to buy the tire and wheel than just buying new 16" tires.

[cummins2014]

3 dog nights wrote:
Goodyear G-614's !

Why not, and pay double for them over the Sailuns, and arguably an inferior tire to the Sailun, but JMHO

[3_dog_nights]

Goodyear G-614's !

[theoldwizard1]

Ignore "ply" ratings. At one time it really had meaning. Not much any more. The best thing is to look at actual load rating (in pounds) on the side of the tire.

Also remember you can use LT (light truck) tires in place of ST (specialty) as long as they meet the load rating. Usually more choices in LT tires.

[2oldman]

johntank wrote:
Somewhere on the tire it will give the number of plies in the tread and sidewall areas and the materials used for the plies.
This is where the OP came up with his tires being 5 ply IMHO.

That's what I asked him.

[johntank]

Somewhere on the tire it will give the number of plies in the tread and sidewall areas and the materials used for the plies.


This is where the OP came up with his tires being 5 ply IMHO.

[time2roll]

Just verify the wheel is rated to handle the pressure.
I would only buy tires that have a load rating for the entire GVWR.

[CALandLIN]

smarty wrote:
Need to replace tires on my 38' fifthwheel that weighs 18,000 lbs
Tires that came with rig are five ply
I got a great deal on 12 ply tires
Any reason for not upgrading to 12 ply tires?

You should better describe a five ply tire. Is that three belt plies and two sidewall plys?

In today's tire industry, ST & LT tires load capacities are defined by a single load range letter following a tire service description or written out on the tire sidewall like this, LRD. A LRD tire would be equal to an 8 ply tire in the old ply rating system.

[memtb]

smarty wrote:
Need to replace tires on my 38' fifthwheel that weighs 18,000 lbs
Tires that came with rig are five ply
I got a great deal on 12 ply tires
Any reason for not upgrading to 12 ply tires?

I hope not.... We’re running “H”rated tires on ours!

[jkwilson]

fj12ryder wrote:
I don't believe that radial tires actually would have 14, 10, or even 8 "plies". Plies have pretty much not been a real thing since bias ply tires bit the dust mostly. IMO it is probably more important to go by weight and carrying capacity. But that's JMO.

This is correct.