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Old 07-18-2012, 09:34 PM   #1
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Another Tire ? For Incoming 13 JKU

I just ordered a 13 Sport S JKU and now it's time to go shopping. I mentioned to the dealer that I immediately wanted to upgrade tires to Duratracs. She walked me to the parts department and the gentleman there simply looked up the stock 255/65-17 size and said nope.

Sensing his lack of motivation and my lack of time, I decided to not press the issue and ask the real experts here. I've spent the last hour reading tire threads and my head is spinning and I think I have an answer but not 100% sure still.

So the question is...will the 265/70-17 Duratrac fit without rubbing and no lift? The next question is are there any back spacing sizes I should look for on a wheel for said tire?

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Old 07-18-2012, 09:39 PM   #2
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Have you searched the forum here about this? 1,000 of threads on what you need to know. Check out largest tire on a stock JK and the many....many others.

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Old 07-18-2012, 09:47 PM   #3
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Old 07-18-2012, 10:01 PM   #4
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I read both of those threads, but the sizing still makes no sense to me. From what I've read it would seem that,yes, that size will fit fine, however the lack of an answer from the guy at the dealer has me questioning myself.

So can someone confirm my belief that the 265/70-17 Duratracs will fit a non lifted sport s? Is anyone here running this tire size non lifted and if so what are your thoughts...especially on snow
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Old 07-18-2012, 10:19 PM   #5
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they will fit with no problem.
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Old 07-18-2012, 10:35 PM   #6
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Thanks griff for the response
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Old 07-18-2012, 10:48 PM   #7
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No problem. That tire size is only 10mm wider than your stockers, and an inch and a half taller, so you're golden.
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Old 07-18-2012, 11:03 PM   #8
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Quote:
Originally Posted by telegooner View Post
I read both of those threads, but the sizing still makes no sense to me. From what I've read it would seem that,yes, that size will fit fine, however the lack of an answer from the guy at the dealer has me questioning myself.

So can someone confirm my belief that the 265/70-17 Duratracs will fit a non lifted sport s? Is anyone here running this tire size non lifted and if so what are your thoughts...especially on snow
Like JKralph said, they will fit. I am running the Dtrac in size 285/70-17 on a non lifted Sport. Ran this size for a while on my previous JK. Good snow tire.
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Old 07-19-2012, 05:58 AM   #9
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No problem. That tire size is only 10mm wider than your stockers, and an inch and a half taller, so you're golden.
Are you talking about the stock 16" setup? He is buying an S. The 265 duratrac is a smaller tire than a stock S tire. It is not bigger. It will work fine without any issues since it is smaller than stock. The 285 DT will rub under high flex and will hit the control arm at full turns but otherwise for daily driving it is fine.
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Old 07-19-2012, 06:53 AM   #10
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jeep fenders come off pretty easy. get whatever size tire you want and stick it under there, you'll find out pretty quick if you need wheel spacers or chopped fenders!
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Old 07-19-2012, 09:17 AM   #11
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Are you talking about the stock 16" setup? He is buying an S. The 265 duratrac is a smaller tire than a stock S tire. It is not bigger. It will work fine without any issues since it is smaller than stock. The 285 DT will rub under high flex and will hit the control arm at full turns but otherwise for daily driving it is fine.
I'm getting the Sport S which comes with 255/75-17 stock. This is where I get confused. How can 265-70-17 be smaller. What do each of these convert to in iches i.e. 33's or 32's?

Also it seems a few of you are running the 285. For those actually running the 285 with 17 inch wheels, does they rub with no other mods?
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Old 07-19-2012, 11:47 AM   #12
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How can 265-70-17 be smaller. What do each of these convert to in iches i.e. 33's or 32's?
First number (255) = tire width
Second number (75) = percentage of that width for the sidewall height
Third number (17) = diameter of the opening for the wheel

So, the 255 is a millimeter measurement. If you multiply that by 75%, you get 191.25 millimeters for the sidewall. If you double the sidewall (above and below the wheel), you get 382.5 millimeters which converts to 15.051". When you add the 17" wheel, that brings your total diameter to 32.051"

Using the same math:

70 percent of 265 is 185.5. Times two (above and below the wheel) is 371mm or 14.606". Add the 17" wheel to get 31.606"

So, by pure math, you can easily run a DuraTrac on your stock wheels.

In real life, your 255/75R17 don't quite measure what the math indicates.

I've come to the conclusion that my OE tires, when new have a diameter of 31.8".

You can see how here

You can also see two members (flyinion and jsb432) who currently run those tire on their stock JKUs without issue.

On your stock wheels, you can run the 285, but could run into some rubbing when you turn and flex (offroad).

The threads referenced above will help you out. Once you grasp the metric sizing, it becomes easier to understand. It took me awhile, but one day it "clicked" and now things make more sense.

Enjoy the new Jeep.
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Old 07-19-2012, 11:51 AM   #13
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They are both technically 32's.

25.4mm in an inch, so the 255 is 10" wide, and the 265 is almost 10" and a half.

the measurement 255/75 means the height of the tire from the rim is 75% of the width of the tire, or 7" and a half. Double that measurement (15") and add in the diameter of the wheel (17") and you get 32".

265/70: the height of the tire from the rim is 70% of the width of the tire, or 7.3". Double that figure, add in the diameter of the wheel, and you get 31.6", which folks round up and call a 32" tire.
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Old 07-19-2012, 11:52 AM   #14
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Haha i was too slow. Thanks mgola!
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Old 07-19-2012, 11:56 AM   #15
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Haha i was too slow. Thanks mgola!
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Old 07-19-2012, 02:33 PM   #16
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Yep not having any issues with the 265/70/17's. Incidentally the other day we installed my discos and then put it on a forklift to check travel. It looks like I could have easily stuffed 285's in there with no lift and possibly almost on stock backspacing (i.e. need a steering stop adjustment). Part of that I suspect is especially for the rear, I have stiffer springs with the JKU and max tow. I ended up with 17/59's from the factory. I didn't expect that much room from the 17 springs in the front though.
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Old 07-20-2012, 01:03 AM   #17
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Thanks everyone for the help...now onto wheels looking at the black rock 997s. If I understand correctly I need to go with the 5x5 pattern now what is the difference between the 17-8 versus 17-9. Any recommendations on that with the 265 Duratracs
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Old 07-20-2012, 01:24 AM   #18
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The 17x9 is an inch wider than the 17x8. Go with the 17x8, you don't need the extra width of the 17x9, especially for the size tire you're mounting. I have 33x12.5x15 duratracs on 15x8 wheels with no problems. And yes, you want the 5-5 (or 5-127mm) for the lug pattern.

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