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Old 09-04-2017, 11:08 AM
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Tires: Debating Changing Load Range

So I have a 2016 JKUR that I need tire advice for.

How the rig sits:
I am currently running 35x12.5R17 MTR's with Kevlar in load range "C". I have a somewhat heavy rig now. I have rock hard 4x4 full steel skids, PS crossmember, PS rock sliders, AEV diff covers, AEV rear diff slider, LOD destroyer shorty front with bull bar and skid, Zeon 10-S platinum winch, rear shorty destroyer bumper with carrier, 2 rotopax 2 gallon containers, hi-lift jack, and all the other misc gear I carry plus a passenger or 2.

I noticed I have great traction but my tires when I air down to 12psi they are
super flat when in the rocks, almost to where I am nearly on my rims when on the trail. I feel like I don't have the axle/diff clearance I once did.

My question is with how much heavier my rig is now(about a year later) should I jump up to a range "D" tire? I originally bought my "C" range tires for lightweight performance when the jeep was stock besides the lift and tires. I do have 4.10 gears so it doesn't feel to sluggish and I think the extra 4 pounds on each corner to step up from C to D is bareable without a regear.

I need thoughts and advice from the guru's.

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Old 09-04-2017, 11:39 AM   #2
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in the rocks you actually want your tires to do that. you will not notice one iota of difference as far as power goes with an extra 4lbs at each tire.

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Old 09-04-2017, 11:47 AM   #3
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Tires: Debating Changing Load Range

It really depends what you want/need. Personally, where we go in the bush and rock I wouldn't run anything less then an E rated Tire. Pitbulls are my preference but they are heavy and are designed for the rocks.


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Old 09-04-2017, 11:48 AM   #4
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Rather than guess at the current weight of your rig, find the closest public scale and get it weighed.

The actual weight and a few minutes with the Rim and Tire Association load inflation table should allay your concerns about whether a "D" load range tire would be appropriate.

See, e.g.: https://toyo-arhxo0vh6d1oh9i0c.stack...s_20170203.pdf
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Old 09-04-2017, 07:47 PM
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So what I am trying to figure out is looking at these number:

Tire Size: 35X12.50R17LT

Load Index Value: 111

Carrying Capacity (lbs): 2,405

At what point for weight am I pushing my luck?

I found a public scale at a truck stop but it's not nearby so I am going to try and make it tomorrow.

I estimate it's going to weigh around 5,500-6,000lbs with gear and passengers...damn I wish we could get it with a V8.
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Old 09-04-2017, 08:30 PM   #6
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What specific brand/model tires do you have?
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Old 09-04-2017, 10:14 PM
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I am currently running 35x12.5R17 Goodyear MTR's with Kevlar in load range "C".
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Old 09-04-2017, 11:07 PM   #8
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It's not so much the weight carrying ability as much as it is the sidewall strength for wheeling. C and D rated tires have 2 ply sidewalls while E rated tires will have 3 ply sidewalls.
So even if your Rig weighs 6000lbs (stock JKU is about 4400lbs) that's only 1500lbs a tire. So even a C rated tire has enough weight carrying capability...


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Old 09-05-2017, 02:22 AM   #9
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Quote:
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It's not so much the weight carrying ability as much as it is the sidewall strength for wheeling. C and D rated tires have 2 ply sidewalls while E rated tires will have 3 ply sidewalls. . . .
Not all E load rated tires have 3-ply sidewalls. In fact, most have only 2 plies. Similarly, not all C load rated tires have 2-ply sidewalls. [I used to run a set of 35x12.50-15 BFG MT tires on my CJ-7 that were C load rated and had 3 ply sidewalls.]

The load rating is simply the weight the tire is rated to carry at a particular inflation level. Although a greater load rating typically means stiffer sidewalls, load rating does not translate to the number of plies or equate to sidewall strength which depends upon many factors including the number of plies, thickness of the plies, orientation of the plies, material used, etc.
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Old 09-06-2017, 08:05 AM   #10
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Not all E load rated tires have 3-ply sidewalls. In fact, most have only 2 plies. Similarly, not all C load rated tires have 2-ply sidewalls. [I used to run a set of 35x12.50-15 BFG MT tires on my CJ-7 that were C load rated and had 3 ply sidewalls.]



The load rating is simply the weight the tire is rated to carry at a particular inflation level. Although a greater load rating typically means stiffer sidewalls, load rating does not translate to the number of plies or equate to sidewall strength which depends upon many factors including the number of plies, thickness of the plies, orientation of the plies, material used, etc.


I wouldn't say that. C - 6ply , D- 8ply , E- 10ply... I have yet to come across a E - 10Ply that doesn't have a 3 ply sidewall. Even the 10 ply Duratracs have 3 ply sidewalls.


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Old 09-06-2017, 09:43 AM   #11
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Old 09-06-2017, 11:08 AM   #12
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I wouldn't say that. C - 6ply , D- 8ply , E- 10ply... I have yet to come across a E - 10Ply that doesn't have a 3 ply sidewall. Even the 10 ply Duratracs have 3 ply sidewalls.


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As noted in the link provided by @jadmt , the current alphabetic load rating designations for radial tires no longer correlate to the actual number of plies in the body of the tire, and haven't for several decades. Even the bias ply tires that are still labeled with the number of plies in the tire casing show 6, 8 or 10 ply "rated," not the actual number of plies.

Similarly, an "E" load rating on a LT tire is no guarantee that the tire has 3-ply sidewalls. One notable example is the Goodyear Duratrac, which was once manufactured with 3 sidewall plies for its E load rated sizes but since sometime in 2014 in many sizes the E rated black sidewall Duratracs have been manufactured with only two polyester sidewall plies. See, Duratrac E load no longer a 3 ply sidewall - Expedition Portal.

Again, tire load ratings designate the weight a tire can carry at a particular pressure and have no direct bearing on sidewall strength.
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Old 09-06-2017, 12:44 PM   #13
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Just bought new 315/75R-16 Duratrac E rated for my Daughter, they are still marked 3ply sidewall ....
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Old 09-06-2017, 02:31 PM   #14
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My 245/75-16 load range E Duratracs (purchased last January) have 2 ply sidewalls...
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Old 09-06-2017, 02:50 PM   #15
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Just bought new 315/75R-16 Duratrac E rated for my Daughter, they are still marked 3ply sidewall ....
What is the date code on those tires (the last 4 digits of the DOT code)?



[See also, https://pmctire.com/en/info/tire-spe...s/age-dot.tire.]
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Old 09-06-2017, 03:21 PM   #16
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If you're getting good performance from your C rated tires I wouldn't worry. You're certainly not exceeding their capacity (and frankly you'd be exceeding the stock front axle rating before that anyway). As has been previously said, you want them to envelop the rocks! Less envelopment = less traction when crawling up those steep slopes.
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Old 09-06-2017, 10:06 PM   #17
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Date code 3715 reconfirmed Polyester 3ply sidewall.


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