Load C or D rated tires?

tjkj2002 · **Posted:** Sun Jul 06, 2008 10:24 pm

jason thompson wrote:

daspes wrote:

So if weight doesn't matter and only OD does, why did I gain nearly 2 MPG when going from a heavier 245/75 to a lighter 265/75? I stick with my real world knowledge learned from the track that unsprung weight matters, my real world experience with my KJ and what R&D has proven.

because you are
A - in denial
B - a liar
EVERY ONE I know who has gone to a bigger tire has lost MPG EVERY ONE not some ALL

I too will stick to what I know
2 rigs
same gears
same increase in tire OD
same average loose in MPG
one tire is only a few pounds more than the OE tire
the other close to 25% more weight

I'll recomfirm but after I put my 35" tires on I'll actually gain mpg's,but I'll be able to gear correctly for them also :wink:

.

And no you do not always lose mpg's when going to a larger tire,if you gear for the larger tires and have the low end power(Jeeps don't) you will no ,lose any mpg to notice a difference,actually some diesel pickups have gained mpg's from going larger in tires.But 90% of the time you will lose some,maybe only 1mpg but other times you can lose up to 10mpg's,it depends on what sized you go to,if you gear right,and if you still have the power to turn them.

daspes · **Posted:** Sun Jul 06, 2008 10:56 pm

jason thompson wrote:

daspes wrote:

So if weight doesn't matter and only OD does, why did I gain nearly 2 MPG when going from a heavier 245/75 to a lighter 265/75? I stick with my real world knowledge learned from the track that unsprung weight matters, my real world experience with my KJ and what R&D has proven.

because you are
A - in denial
B - a liar
EVERY ONE I know who has gone to a bigger tire has lost MPG EVERY ONE not some ALL

I too will stick to what I know
2 rigs
same gears
same increase in tire OD
same average loose in MPG
one tire is only a few pounds more than the OE tire
the other close to 25% more weight

Thanks, kinda personal and uncalled for but... My OD increased 1.1" and weight decreased 26# per tire. From MT/R's to a P-rated A/T's.

The 2 rigs you compare as if the were twins are two different models, with 2 different engines, 2 different drivetrains, and 2 different power figures, and 2 different torque curves. Yes OD matters, and yes both rigs lost milage, but I am willing to bet that the rig with the heavier tires lost a larger percentage of its milage than the other. It still may have equaled the same amount of loss.

Anyway your the expert, take our pick A. or B.

jason thompson · **Posted:** Sun Jul 06, 2008 11:50 pm

tjkj2002 wrote:

jason thompson wrote:

daspes wrote:

So if weight doesn't matter and only OD does, why did I gain nearly 2 MPG when going from a heavier 245/75 to a lighter 265/75? I stick with my real world knowledge learned from the track that unsprung weight matters, my real world experience with my KJ and what R&D has proven.

because you are
A - in denial
B - a liar
EVERY ONE I know who has gone to a bigger tire has lost MPG EVERY ONE not some ALL

I too will stick to what I know
2 rigs
same gears
same increase in tire OD
same average loose in MPG
one tire is only a few pounds more than the OE tire
the other close to 25% more weight

I'll recomfirm but after I put my 35" tires on I'll actually gain mpg's,but I'll be able to gear correctly for them also :wink:

.

And no you do not always lose mpg's when going to a larger tire,if you gear for the larger tires

well at least some one else knows this besides me

Guest · **Posted:** Mon Jul 07, 2008 12:52 am

jason thompson wrote:

InCommando wrote:

My Trxus M/T's are e-rated. But, like yours, they are not on a KJ so my tires or yours really do not matter, huh? No one gives a crap (again) what you run on your TJ or what you do with it.

these are the same tire you were telling me about in a past PM ,to bad I empty my box, right?
because I checked Interco for them and the 33 12.5 15's are a 6 not a 10 ply

his 33s are 285/75-16s just as my 31s are 245/75-16s

Inc · **Posted:** Mon Jul 07, 2008 1:45 am

Should I start a countdown until this becomes a locked thread. :lol:

So much for keeping this civil. :shock:

KJ 119 · **Posted:** Mon Jul 07, 2008 4:17 pm

I'm sure when Dieselenthusiast asked this question,he was going for a simple answer,not
this scientific bickering cr@p.

sleeve84028 · **Posted:** Tue Jul 08, 2008 8:17 am

So what was the question again? [i read from the OP, but I got lost in the banter]

Ah yes - here we go...

dieselenthusiast wrote:

Just so I can clarify, we don’t want anything more than a LOAD C and maybe a LOAD D rated off-road tire, right? I'm not pulling. My purpose to to reduce as much weight as possible and still have a good off-road tire. Any input would be great.

All Load Range C tires will be 6-ply. If you wheeled smart, your sidewalls will survive. The real savings will come in when you compare the weight of each tire. I'd try for the lightest tire in the 6-ply catagory for your weight [MPG] savings quest. Knowing well in advance that you are trading off some "sidewall" strength for weight and comfort.

Tires Explained

dieselenthusiast · **Posted:** Tue Jul 08, 2008 11:40 am

sleeve84028 wrote:

So what was the question again? [i read from the OP, but I got lost in the banter]

Ah yes - here we go...

dieselenthusiast wrote:

Just so I can clarify, we don’t want anything more than a LOAD C and maybe a LOAD D rated off-road tire, right? I'm not pulling. My purpose to to reduce as much weight as possible and still have a good off-road tire. Any input would be great.

All Load Range C tires will be 6-ply. If you wheeled smart, your sidewalls will survive. The real savings will come in when you compare the weight of each tire. I'd try for the lightest tire in the 6-ply catagory for your weight [MPG] savings quest. Knowing well in advance that you are trading off some "sidewall" strength for weight and comfort.

Tires Explained

Thanks for the link! The KJ will see very little “hardcore” off-roading. We use the KJ for backcountry trips and getting up and down recreation and forest roads that are not maintained. We own property at 7,000 feet in New Mexico near the Continental Divide. There’s a lot of National Forest and Reservation land with dirt roads. I’m more less building up the Jeep as a hobby, although the lift and desire for taller tires will help with high snow levels as many roads that we travel do not always get cleared. I’ll check out the individual tire weights before I buy. Sidewall tire protection is important to me. I’m not sure what relationship airing down has to the type of sidewall ply. I guess I have more to research.

tjkj2002 · **Posted:** Tue Jul 08, 2008 1:06 pm

sleeve84028 wrote:

So what was the question again? [i read from the OP, but I got lost in the banter]

Ah yes - here we go...

dieselenthusiast wrote:

Just so I can clarify, we don’t want anything more than a LOAD C and maybe a LOAD D rated off-road tire, right? I'm not pulling. My purpose to to reduce as much weight as possible and still have a good off-road tire. Any input would be great.

All Load Range C tires will be 6-ply. If you wheeled smart, your sidewalls will survive. The real savings will come in when you compare the weight of each tire. I'd try for the lightest tire in the 6-ply catagory for your weight [MPG] savings quest. Knowing well in advance that you are trading off some "sidewall" strength for weight and comfort.

Tires Explained

Youir false in saying all load range "C" tires are 6-ply,that hasn't been true for years and some of that info in that link is old info and no longer applies.

Below is a 31x10.50R15 BFG AT,8 ply tire with a "C" load range.

Below is my 35x13.50R15 Toyo Open Country MT's,10 ply tires and still a load "C" rating.

sleeve84028 · **Posted:** Tue Jul 08, 2008 1:42 pm

The post and information is still valid. 6 ply is still the standard for a load range C tire. That's cool if your tire is has 10 ply but not everyone needs that much tire.

tjkj2002 · **Posted:** Tue Jul 08, 2008 2:10 pm

sleeve84028 wrote:

The post and information is still valid. 6 ply is still the standard for a load range C tire. That's cool if your tire is has 10 ply but not everyone needs that much tire.

6-ply is no longer the standard for load range "C" tires anymore,probally less then 50% of load range "C" tires have 6 ply's these days,10 years ago it was but not now.It is becoming the standard for "P" rated tires though.

dieselenthusiast · **Posted:** Tue Jul 08, 2008 11:52 pm

tjkj2002,

So currently you are running a 7 ply tread and 3 ply sidewall. Is 3 ply the standard sidewall protection for most off-road tires? Does the number of ply affect airing down and tire travel at low speeds (rock crawling)?

sleeve84028 · **Posted:** Wed Jul 09, 2008 7:59 am

Yes.

The more plies the tire has (specifically on the sidewall) the stronger that portion of the tire will be.

My non "Load Range C" Destination tires have a 2 ply sidewall. I've never had to air them down though so I can't comment on what kind of performance they would have. Still when aired up they do the job

dieselenthusiast · **Posted:** Sun Dec 07, 2008 5:26 am

Okay, I had to revisit this thread before making my final tire purchase. I will be towing a 4,000 lb. travel trailer, so I may need to factor that into my “LOAD RANGE” decision. Plus, I now have an ARB bumper, winch, and a RL rear bumper coming. So, perhaps “LOAD RANGE” may play a bigger role than what I had originally planned.

dieselenthusiast · **Posted:** Tue Jan 20, 2009 1:57 am

Two Tire Choices Remain:

TOYO OPEN COUNTRY A/T P265/70/R15 (35 lbs) (7.0 - 9.0 rim width) (29.7 tall on 8 width) (2337 lbs max load)
TOYO OPEN COUNTRY A/T 30X9.50R15LT Load C (36 lbs) (6.5 - 8.5 rim width) (29.5 tall on 7.5 width) (1985 lbs max load)

However, tjkj2002 said I should avoid a P rated tire...................... But why does the P rated tire have a heavier max load than the Load C range?

Guest · **Posted:** Tue Jan 20, 2009 2:35 am

Because it is a smaller tire and the 265/75-16 is designed for a larger vehicle.

A lot more rubber on the road, and less pounds per sq in on the ground

I can come up with some more BS explanations if you like :lol:

dieselenthusiast · **Posted:** Tue Jan 20, 2009 9:12 pm

ThunderbirdJunkie wrote:

Because it is a smaller tire and the 265/75-16 is designed for a larger vehicle.

A lot more rubber on the road, and less pounds per sq in on the ground

I can come up with some more BS explanations if you like :lol:

I called Toyo today, and the tech lady said that I definitely want to stay away from the P rated tire for my application and driving purposes. The P rated tire comes standard with a 4 ply and is basically an OE replacement. The LT Load C comes in a 6 ply. I also found it interesting that I would have to subtract the load max by 10% if I wanted to run a P rated tire on a truck or SUV. SO…………with that being said, I’m going with the 30X9.50R15 LT Load C.

05infernoCRDL · **Posted:** Tue Jan 20, 2009 11:09 pm

i just stumbled upon this thread...

can i add that most of you were talking about weight and OD (which do play a role) and sprung and unspring (in only know what i have read on here about that...

what i want to add is moment of inertia, the energy it take to get something moving (or rolling in out case)...
a larger OD and heavier tire will have a greater moment of inertia...
a larger OD and lightre tire will have a smaller moment of inertia..

i feel it is more delendent on that moment of inertia than amything else

Guest · **Posted:** Wed Jan 21, 2009 2:37 am

dieselenthusiast wrote:

ThunderbirdJunkie wrote:

Because it is a smaller tire and the 265/75-16 is designed for a larger vehicle.

A lot more rubber on the road, and less pounds per sq in on the ground

I can come up with some more BS explanations if you like :lol:

I called Toyo today, and the tech lady said that I definitely want to stay away from the P rated tire for my application and driving purposes. The P rated tire comes standard with a 4 ply and is basically an OE replacement. The LT Load C comes in a 6 ply. I also found it interesting that I would have to subtract the load max by 10% if I wanted to run a P rated tire on a truck or SUV. SO…………with that being said, I’m going with the 30X9.50R15 LT Load C.

Uh

huh?

No clue what this wench must have been smoking, but your KJ DID kind of COME WITH std load tires...not like it came with LRF tires and you're going to a P-metric.

Really kinda confused about what this chick said, since it makes 0 sense.

You will be fine with a 4p tire if you don't have any gonzo-nuts tongue weight.

dieselenthusiast · **Posted:** Wed Jan 21, 2009 8:44 pm

All of Toyo’s P-rated tires are 4 ply, which meets or exceeds the OE standards, this is why they refer to their P-rated tires as being an OE replacement. If I did not add bumpers, a winch, armor, and a lift, then I could go with a Toyo P-rated tire. However, due to the added accessories and the fact that I want to use the tires for off-roading and towing, then she only recommended the LT tires, which are 6 ply. She was actually very nice, very knowledgeable, and seemed to know her product knowledge.

Load C or D rated tires?

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