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Old 06-09-2014, 01:06 PM   #1
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Which size nitto?

I'm about to pull the trigger on some Nitto Trail Grapplers for my '13 JKU. I was wondering if you would go with the 315/70R17D (34.6"x13.27") or the 285/75R17E (34.09"x11.57").

I'm running a 2.5 RK lift and am a fairly light rig with just rubi rails, ace sliders and Terraflex HD hinge. I have 3:73 stock gears and a Superchips Flashpaq. I'll be running these on a 8.5" wide wheel.

I originally had my eye on the 315/70R17D but after looking a little hard I saw the 285/75R17E. After looking them over, here are my thoughts:er

- 315/70 are load range D versus the 285/75 which are E rated. I was originally looking at the 315/70 due to the D rating, however I wonder with the closeness in height but difference in width would make the 285/75 lighter in weight?
- The 285/75 are not as wide as the 315/70.....11.57" vs. 13.27". I thought maybe the less width would be better for my rig since it's a DD.
- There isn't much difference in height between the two......34.6" vs. 34.09".

So which size would you go with?

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Old 06-14-2014, 09:42 AM   #2
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Any thoughts on this?

I know one is D rated and one is E rated and most people say don't get E rated tires for the jeep. However, I see a lot of people running e rates tires and just keep the pressure down.

Would I be better off getting the slightly smaller tire due to the nitto's weight like maybe a 295/70? It's 33.54x11.97. The slightly shorter height I don't think will be a big deal.

FYI my JKU is a '13 with 3:73 gears.

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Old 06-14-2014, 07:51 PM   #3
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What's the d and e rating?
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Old 06-14-2014, 11:32 PM   #4
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not sure if this helps you at all, but I went with 315/70/17 because they were D load. I have a 2 door on 2.5 RK lift and they measure right at 34 on my jeep.

And I have 3.73 gears and there is a noticeable difference in power loss but it isn't unbearable.
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Old 06-15-2014, 01:10 PM   #5
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Quote:
Originally Posted by zenman View Post
What's the d and e rating?
The info I found:
315/70R17 D max load pressure 3195/2910

285/75R17 E max load pressure 3195/2910
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Old 06-15-2014, 01:19 PM   #6
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We're more into over landing than rock crawling or mudding so when we swap out our tires I'm leaning toward either the LT285/75R17E or maybe a 279/70/R17E. I want a tire within the stock fenders.
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Old 06-15-2014, 05:59 PM   #7
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On my 13 JKU with 3.73 gears I run a RK 2.5 lift on 305/70/17 (34) which differ from 285/75/17 in width only by being ~1" wider. I found no noticeable loss in power and maybe .5 mpg difference from 32" tires I ran prior.

Running 17" OEM rims with 1.25" spacer there is no rubbing at fun turn or max flex (sway bars disconnected).

You do have to use a Procal or other system to set your speedometer but other than that the size is a good in-between for both looks and on/off road performance.

On the E rating, I have found no issues either on the road or off. I run mine at 31 psi cold on road and between 12-18 psi off road depending on terrain.

If you check my images they show the size on a recent trip
over Gold Mountain trail in Big Bear Ca. Although not Nitto tires it might help to visualize the tire size and a 2.5" RK lift on a JKU.
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Old 06-15-2014, 06:41 PM   #8
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I'll be interested to know what you ultimately go with, and why. I'm in the same boat as most replies on the thread with 3.73s and am planning on the RK 2.5". Haven't yet decided on the Trail Grapplers vs. DuraTrac‎ vs. others so any thoughts you can share on your decision would be great!
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Old 06-15-2014, 07:35 PM   #9
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We currently are running factory rims and 265/70R17E KM2s with the 3.73 gear set. I have had no issue with the E rated tires and will be looking to keep the rating when we go with a larger diameter on a 4.5BS wheel before next Spring as I want a tire I can beat on. I have pretty much narrowed the playing field to either Nittos or Toyos, what I need to do is decide on a rim to mount them on.
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Old 06-15-2014, 07:38 PM   #10
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Quote:
Originally Posted by zenman View Post
What's the d and e rating?

Light Truck Tires

Since light truck tires are often available in multiple load ranges, the appropriate load range is identified immediately following the size's rim diameter in Tire Rack's descriptions.

LT-metric, LT-flotation and LT-numeric tires are branded with their load range (load range E or LRE) or their ply rating (10 ply rated) on their sidewalls and list their appropriate load range letter in their descriptions as LT245/75R-16 E, 7.50R-15 D or 31x10.50R-15 C. LT-sized tires featuring section widths of 305mm/12.50” or wider have their maximum loads and cold tire pressures rated at reduced maximum load pressures.

The chart showing the letter ratings and the loading didn't cut and paste well, you can find it here,

http://www.tirerack.com/tires/tirete....jsp?techid=55
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Old 06-15-2014, 11:01 PM   #11
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Quote:
Originally Posted by MAG00 View Post
Any thoughts on this?

I know one is D rated and one is E rated and most people say don't get E rated tires for the jeep. However, I see a lot of people running e rates tires and just keep the pressure down.

Would I be better off getting the slightly smaller tire due to the nitto's weight like maybe a 295/70? It's 33.54x11.97. The slightly shorter height I don't think will be a big deal.

FYI my JKU is a '13 with 3:73 gears.
The height difference between the tires will be barely noticeable, but the difference in width is very significant. The 285's are pretty narrow for a 34" tire. Many people like the "pizza cutter" look, and in some conditions they will perform better than a wider tire with the same tread, so you should consider what you want to accomplish.

Is this for looks or performance and what terrain/conditions will you be driving in?
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Old 06-16-2014, 12:19 PM   #12
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Quote:
Originally Posted by American Jeeper View Post
The height difference between the tires will be barely noticeable, but the difference in width is very significant. The 285's are pretty narrow for a 34" tire. Many people like the "pizza cutter" look, and in some conditions they will perform better than a wider tire with the same tread, so you should consider what you want to accomplish.

Is this for looks or performance and what terrain/conditions will you be driving in?
It is for both. LOL Generally the terrain around here is simple rolling hills, mud, rutted fire roads, etc. Not much rocks around here, unless I go out of town to an off road park that has some.

I didn't figure there being much height difference, but I thought maybe the more narrow tire would be a little less weight and a little easier on my current 3:73 gearing. I figured the wider tire would take a little more power to push down the road (both on and off).

I know that for my day to day driving and that with a large majority of my use being on road that something like the GY Duratrac would probably be a better general use fit for me. However, I have stuck in my head that I want the MT due to looks and when I get off road in the mud I don't want to be spinning "slicks" (read that as a tire not clearing out).
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Old 06-16-2014, 04:25 PM   #13
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Quote:
Originally Posted by MAG00 View Post
It is for both. LOL Generally the terrain around here is simple rolling hills, mud, rutted fire roads, etc. Not much rocks around here, unless I go out of town to an off road park that has some.

I didn't figure there being much height difference, but I thought maybe the more narrow tire would be a little less weight and a little easier on my current 3:73 gearing. I figured the wider tire would take a little more power to push down the road (both on and off).

I know that for my day to day driving and that with a large majority of my use being on road that something like the GY Duratrac would probably be a better general use fit for me. However, I have stuck in my head that I want the MT due to looks and when I get off road in the mud I don't want to be spinning "slicks" (read that as a tire not clearing out).
Thoughts on this latest post/info?
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Old 06-17-2014, 05:33 AM   #14
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Go with the 315's as the look is awesome.

The difference in ride and rolling weight isn't noticeable.

Here is a set on my JKU before I went to 37's.


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