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Old 05-10-2013, 11:07 PM   #691
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Originally Posted by firefighterxi View Post
Thanks again for all your help. It's cool that there is a place to go to get good solid advice.
No problem.

I would've been completely lost in the beginning without this forum.

By all means ask away--I wasn't suggesting you shouldn't, merely making sure you were aware of your available resources.

Leveling kit: http://www.quadratec.com/products/16190_1100_07.htm

Goggle image search "TeraFlex leveling kit JK" and you'll find a lot of pics.

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Old 05-12-2013, 09:59 AM   #692
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Thanks for the info MTH. Do you happen to know if a 1 inch suspension lift would be sufficient for preventing rubbing while offroading with the Duratrac 33s or would I need at least 2 inches? I know it's probably not cost effective to get just a 1 inch lift, but I'm trying to minimize loss of handling and garage parking issues.

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Old 05-12-2013, 10:31 AM   #693
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Originally Posted by SF rubi View Post
Thanks for the info MTH. Do you happen to know if a 1 inch suspension lift would be sufficient for preventing rubbing while offroading with the Duratrac 33s or would I need at least 2 inches? I know it's probably not cost effective to get just a 1 inch lift, but I'm trying to minimize loss of handling and garage parking issues.
U can get a TF leveling kit which gives u 2" in the front and 1" in the rear. There is a thread for exactly that, 33's and leveling kit so u can see pics. I have the leveling kit but not the 33's....yet.
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Old 05-12-2013, 11:38 AM   #694
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First off, I appreciate all the information and support so far in this post. Has helped a newbie like myself tremendously.

I believe in your first post you mentioned a common size people run is 16"- 33"

I ran some prices from the 18" to 16" and curious if there are any potential issues.

Stock 255/70/18

16" with Rims
Pro Comp Wheels 7069 Flat Black
16x8
BS-4"
Offset-11mm

Duratrac
LT285/75r/16

Was also considering Duratrac 275/65/18 with 1.5 spacers and just getting some rims down the road. Haven't read a definitive answer on whether these rub with spacers.
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Old 05-19-2013, 04:56 PM   #695
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Well, I've already had my first Jeep about a week so it's time to start changing stuff. It's an 07 Unlimited Rubicon. I've narrowed down the wheels to 17" XD ADDICTs with +18mm offset. This will be for 95% on road use. You guys are the authority, so please look over my choices and guide me.

Nitto Trail Grappler 285/70/17, 295/70/17, 285/75/17
Dick Cepek FC 285/70/17, 33x12.5x17
Goodyear Duratrac 285/70/17

I'm not opposed to doing a leveling kit in the future if needed. And please suggest something else entirely if something else would work better. Thank you!
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Old 05-19-2013, 05:06 PM   #696
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I'm with the above 2 posters. Thanks for this sticky and the information it has provided. I have had my Jeep less than 1 week and I am planning away.
I want to run wheels that look similar to the stock rims but obviously the stock rims have a BS that necessitates spacers and I don't want spacers to run larger tires.

I am looking at Mamba MR1s in 17X8. They have offset of +6mm and have a BS of 4.75. Here is a link: http://mambawheel.com/Mamba_Images/P...ch%20Sheet.pdf

I know BS of 4.5 is ideal but these should fit no problem provided I have a lift, correct? On road and off road? These maintain the near factory looking rims with a better BS to run larger tires.

As for tires, I am looking to run maybe some 315/70. Is this a good size selection? The vehicle is my DD but I want to be more than capable for offroading. I probably won't be doing rock crawling or anything extreme. My lift will likely be the Metal Cloak Dual Spring Unlimited 2.5" lift kit with the front trackbar and the rear trackbar brackets. I am not sure what shocks I will use. Can you suggest a tire that doesn't weigh a ton and kill my gas mileage but pleasurable on the street and capable off road? (If a tire like that exists). Thank you for help!
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Old 05-20-2013, 08:39 PM   #697
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Greetings all!

Long time lurker first time poster.

I have a 2013 JK Sport S. (stock) I've poured over these forums like a madman trying to find an answer and cannot seem to find a concrete answer. (Or I may just be blind)

Anyway! I was wondering if 16" rims with 4.5 or less BS would fit stock, no lift, no leveling kit, 2013 JK.

I've been told that 16" rims won't clear the caliper others tell me it will fit without issue. Before I pull the trigger I would LOVE to know who is right.
Am I stuck with a 17" or larger option or can I go with the Oh-So-Much cheaper 16".

Thanks in advance!
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Old 05-20-2013, 10:23 PM   #698
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Originally Posted by Squares View Post
Greetings all!

Long time lurker first time poster.

I have a 2013 JK Sport S. (stock) I've poured over these forums like a madman trying to find an answer and cannot seem to find a concrete answer. (Or I may just be blind)

Anyway! I was wondering if 16" rims with 4.5 or less BS would fit stock, no lift, no leveling kit, 2013 JK.

I've been told that 16" rims won't clear the caliper others tell me it will fit without issue. Before I pull the trigger I would LOVE to know who is right.
Am I stuck with a 17" or larger option or can I go with the Oh-So-Much cheaper 16".

Thanks in advance!
That's just something tire shops do--they have a computer that tells them the stock size, and the safest thing to do is just tell you nothing smaller will fit.

The JK Sport (rather than Sport S) come with identical brakes and 16" wheels.

I, and many others, have 15" wheels.

16" wheels clear the calipers on the US version of the wrangler with room to spare. Many here have them.
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Old 05-21-2013, 05:01 PM   #699
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Thanks much, MTH!
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Old 05-22-2013, 10:46 AM   #700
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would a 15x8 with 19mm or 30mm offset be better? With a 35x12.5 wheel.
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Old 05-22-2013, 10:51 AM   #701
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Originally Posted by mrbullitt View Post
would a 15x8 with 19mm or 30mm offset be better? With a 35x12.5 wheel.

Use the formula in the 2nd post and do the math. It will tell you which one has more back spacing. One is going to have about 3" the other will have almost 4".
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Old 05-22-2013, 10:59 AM   #702
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Awesome information!! i've been wondering about this
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Old 05-22-2013, 11:12 AM   #703
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Originally Posted by PhotoWrangler View Post
Use the formula in the 2nd post and do the math. It will tell you which one has more back spacing. One is going to have about 3" the other will have almost 4".
-19mm / 25.4 = -.748" + (((8"+1")/2)= 4.5") = 3.752" BS

-30mm / 25.4 = -1.18" + (((8"+1")/2)= 4.5") = 3.32" BS

Is this right?
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Old 05-22-2013, 12:56 PM   #704
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Use this tool it makes it so much easier

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
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Old 05-22-2013, 03:22 PM   #705
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Originally Posted by mrbullitt View Post
-19mm / 25.4 = -.748" + (((8"+1")/2)= 4.5") = 3.752" BS

-30mm / 25.4 = -1.18" + (((8"+1")/2)= 4.5") = 3.32" BS

Is this right?
Yes. That's the same thing I got.
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Old 05-22-2013, 09:11 PM   #706
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Hope you can clear some things up for me. I have a stock 2012 rubicon. Some things that may or may not change the outcome of your answer to how big can I go on tires and rims without rubbing and totally killing mpg :
I have a fully outfitted gobi rack with all around ridged lighting.
I tow a single axle 8' motorcycle enclosed V-shaped trailer on weekends and average 550 miles a weekend.
I like the big look and wide look but do not plan on lifting at all.
I was told that I can go 17x9 with a -12 offset & 4.53 backspace.
The tires I think I want are Mickey Thompson 33x12.50R-17LT, Baja MTZ Radial Tire.
Are these correct?
Can I go wider on rims and what offset and or backspace is needed.
Are there better tires that are aggressive but sutuble for more road and off roading as well.
Thank a million!
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Old 05-25-2013, 09:01 AM   #707
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Newbie here with post #1......and of course I have a question about tires:

I purchased a 2013 Unlimited Sport "Freedom Edition" this week. My wife likes the Mineral Gray painted wheels (window sticker says they are 17 x 7.5") so I'm locked in to keeping those...for now. The stock Good Year 255/75/17s are alright but I'm looking for something with a little more aggressive appearance and only about an inch increase in overall height (don't want to mess with lift, spacers, etc..). This vehicle is a daily commuter with a drive on some logging trails in North Carolina every once in awhile. I've paged through all the posts on this topic and it made my head spin..... 275/70/17, 265/70/17, 285/75/17......Help!!!!!

BTW....it's great to be a part of this forum, surrounded by a lot of people with a lot of Jeep knowledge!!!
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Old 05-25-2013, 09:30 AM   #708
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Great info and easy to understand. You have really helped with my decisions.
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Old 05-25-2013, 09:31 AM   #709
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Newbie here with post #1......and of course I have a question about tires:

I purchased a 2013 Unlimited Sport "Freedom Edition" this week. My wife likes the Mineral Gray painted wheels (window sticker says they are 17 x 7.5") so I'm locked in to keeping those...for now. The stock Good Year 255/75/17s are alright but I'm looking for something with a little more aggressive appearance and only about an inch increase in overall height (don't want to mess with lift, spacers, etc..). This vehicle is a daily commuter with a drive on some logging trails in North Carolina every once in awhile. I've paged through all the posts on this topic and it made my head spin..... 275/70/17, 265/70/17, 285/75/17......Help!!!!!

BTW....it's great to be a part of this forum, surrounded by a lot of people with a lot of Jeep knowledge!!!
Try this site. You can key in factory size and the sizes you are looking at. Without spacers you need to watch width. Personally I would try to get some duratracs as they have that aggressive look and from what I read are very well mannered. Quit as well compared to others.

http://www.net-comber.com/tirecalc.html
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Old 05-25-2013, 09:52 AM   #710
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One of the most frequently asked questions on this forum is “What's the largest tire I can fit on my stock/unlifted 07+ JK?”. So, I put this post together that can either be made a sticky, or something that we can link to whenever this question arises.

Have to give thanks to kbwwolf for proof-reading and making a few tweaks here and there. Thanks bro!

First things first. Jeeps come stock with 3 different tire sizes:
1. 225/75/16 (29”x9”)
2. 255/75/17 (32”x10”)
3. 255/70/18 (32”x10”).

The backspacing on stock JK wheels is 6.25". That means that the mounting surface of the wheel is 6.25” from the rear lip of the wheel. The larger the backspace number, the further under the fender (and closer to suspension components and airdam) the wheel will be. (see below image)


I see posts all the time saying that a 33” tire will fit the stock JK just fine, and that is semi-true. In reality, this question requires a 2 part answer. The first part deals with tire diameter. The second part deals with width.

It is true that the largest diameter tire you can fit on a stock JK without issue (read on) is 33” in diameter. With this diameter, you shouldn’t have any issues on the street. However, you could get some contact with your fenders if you flex offroad. Disconnecting your front sway bar will cause contact with your fenders.

Now let’s take a look at tire width. People often overlook this aspect when choosing a tire. The width on most 33's range from 10” – 12.5”+.

On Stock Wheels
The largest tire you can fit without a chance of problems on road is a 33x10 tire (also called a “pizza cutter”). An example is the 255/80/17 BFG KM2. Because this tire is the same width as most stock JK tires, there is no issue on road, despite the larger diameter. You can run this size without issue.

Now, let’s consider some tires that could potentially cause slight issues on road; the 33x11s. The common sizes of these would be 285/75/16, 285/70/17, and 275/70/18.

The 275/70/18 measures slightly under 11” wide, while the other two measure a little over. Many folks have reported running these sizes without issue. However, others have experienced contact with the airdam or front suspension components. Simple fixes are to add washers to the steering stops, trim the airdam, or install wheel spacers.

Any tire larger than 11” in width, you are almost guaranteed to have to do one of the above mentioned mods. In fact, if you go too much wider than the 11” tire on stock wheels, you stand a good chance of making contact with your rear swaybar end link. If that is the case, wheel spacers can correct this issue. Common sizes are 295/70/17 (33x11.6), 305/60/17 (33x12), 305/70/16 (33x12), 295/65/18 (33x11.6).

On Aftermarket Wheels
As I mentioned initially, the stock wheels have a backspacing of 6.25”. This is too deep of a backspace to allow proper clearance for a decently wide tire. The general consensus is that the “magic number” for backspacing for the JK is 4.5” or less. It does not mean you can't run a wheel with 4.6”+. But 4.5” and under is the safest bet.

Many 15” wheels have less (sometimes a lot less) than 4.5”. That's so the wheel clears the brake calipers. Most 15” wheels come with 3.75” of backspacing (MB72, MB TKO, etc). There are a few that come with more (such as the Black Rock 909 – 4”) and some that come with less (such as the Level 8 Tracker – 3.32”). Just remember, the lower the backspace number, the further out the wheel will sit from the Jeep body. One of the most common wheel/tire combos on this site is the 15x8 MB 72 wheel with 33x12.5x15 Duratrac tires. Dozens of people run this setup without a single issue on the street. However, just like most of the other 33” combinations, you can get some fender contact when offroad.

Also, be aware that, while many 15" alloy wheels will fit over the Wrangler's brake calipers, most 15" steel wheels will not.

Once you get into 16”+ wheels, it's pretty easy to select a wheel with a backspace near 4.5”. The most common 33” tire to run with 16” aftermarket wheel is the 285/75/16. A common tire size for the 17” wheel is the 285/70/17.

Links of interest:
Utility to compare tire sizes
Adding washers to the steering stops
This is such a helpful post...thank you
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Old 05-25-2013, 09:54 PM   #711
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Try this site. You can key in factory size and the sizes you are looking at. Without spacers you need to watch width. Personally I would try to get some duratracs as they have that aggressive look and from what I read are very well mannered. Quit as well compared to others.

Car / SUV / Van / Light Truck Tire Calculations

Great info....thanks!!!
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Old 05-26-2013, 10:56 AM   #712
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One of the most frequently asked questions on this forum is “What's the largest tire I can fit on my stock/unlifted 07+ JK?”. So, I put this post together that can either be made a sticky, or something that we can link to whenever this question arises.

Have to give thanks to kbwwolf for proof-reading and making a few tweaks here and there. Thanks bro!

First things first. Jeeps come stock with 3 different tire sizes:
1. 225/75/16 (29”x9”)
2. 255/75/17 (32”x10”)
3. 255/70/18 (32”x10”).

I first wanted to say thank you for this forum and all the information contained, VERY HELPFUL!

Next, I have a question about tire size on stock Jk.

What size tire do the rubi's have stock, and would those tires fit a Sport without any issues?

I always thought they had 33x12.5's from factory?

I'm in the market for a '13 or '14 Sport and want to put these rims on it:

http://www.quadratec.com/products/92615_211X_PG.htm

I'd be wanting to run 33x12.5x17 BFG Mts, and my question is will I need spacers and how much rub do you think I would experience offroad without a lift and factory Sport springs?

How much of a difference is there in the suspension of the Rubi's vs. Sport?

My '08 Rubi I was sure had 33x12.5's and I rode it hard and put it away wet several times, and never had an issue with rub.. Just wondering if I will be so lucky once I get my Sport?


Thanks guys, I really appreciate all the info on this forum..


Cheers
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Old 05-28-2013, 08:44 AM   #713
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Greetings all!

Long time lurker first time poster.

I have a 2013 JK Sport S. (stock) I've poured over these forums like a madman trying to find an answer and cannot seem to find a concrete answer. (Or I may just be blind)

Anyway! I was wondering if 16" rims with 4.5 or less BS would fit stock, no lift, no leveling kit, 2013 JK.

I've been told that 16" rims won't clear the caliper others tell me it will fit without issue. Before I pull the trigger I would LOVE to know who is right.
Am I stuck with a 17" or larger option or can I go with the Oh-So-Much cheaper 16".

Thanks in advance!
Just put American Racing Baha 16" wheels on with 4.5" of backspacing. Went with 265/75/16 Yokohama AT-S tires. They clear with plenty of room to spare and actually have less revs per mile than stock Goodyear 255/75/17's. Shut off tire pressure sensors and also found out that wheel stud clips need to come off. Stock wheels have a recess for this clips but Baha's did not. I went with these tires because of weight, 50# versus 57# on 285's. Stock tires weighed 36#. Priced a whole lot less than 285/75's too.
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Old 05-28-2013, 09:57 AM   #714
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What size tire do the rubi's have stock, and would those tires fit a Sport without any issues?
As noted in the first post, the largest stock tire on a JK is about 32x10. In the case of the Rubicon, that's 255/75/17.

Quote:
Originally Posted by FXnut View Post
I always thought they had 33x12.5's from factory?
Nope.

Those will be fine.

Quote:
Originally Posted by FXnut View Post
I'd be wanting to run 33x12.5x17 BFG Mts, and my question is will I need spacers and how much rub do you think I would experience offroad without a lift and factory Sport springs?
No spacers needed.

The first post in this thread answers your questions as to the rubbing issues. They'll rub the fenders when you flex offroad, but given the backspacing are unlikely to rub the internals of the wheel wells on turns.

Quote:
Originally Posted by FXnut View Post
How much of a difference is there in the suspension of the Rubi's vs. Sport?
There is no predictable difference as to the springs. Rubicons come with different shocks, but the springs may (or may not) be identical.

Quote:
Originally Posted by FXnut View Post
My '08 Rubi I was sure had 33x12.5's and I rode it hard and put it away wet several times, and never had an issue with rub.. Just wondering if I will be so lucky once I get my Sport?
If your 2008 Rubi had factory size tires, they most certainly were not 33x12.5. They were 255/75/17 (about 32x10).

If they were in fact 33x12.5 tires (i.e., upsized aftermarket) then you must either (a) have had a lift and aftermarket wheels/spacers to avoid rubbing, or (b) didn't wheel it or turn it very hard.

Hope that helps.
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Old 05-28-2013, 02:34 PM   #715
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confirm tire / wheel size

I just ordered a set of 325/60/18 for my 10 Sahara. I was told they would fit. low and behold they don't. now I'm looking for new wheels also. can anyone tell me what the backset I am looking for so I don't get rubbing. I ordered 1 1/2 spacers which I will return. thanks
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Old 05-28-2013, 03:16 PM   #716
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I just ordered a set of 325/60/18 for my 10 Sahara. I was told they would fit. low and behold they don't. now I'm looking for new wheels also. can anyone tell me what the backset I am looking for so I don't get rubbing. I ordered 1 1/2 spacers which I will return. thanks
For the most part, this information is all provided in the opening post of this thread.

The tire you've chosen is about a 33x12.8. On stock wheels, that will rub (as discussed in the first post) both the fender flares when flexed offroad as well as the inner wheel well on hard turns.

As also noted in the opening post, you should look for wheels with 4.5" of backspacing or less to solve the problem of rubbing on hard turns. You'll still rub the fender flares if you flex the suspension offroad.
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Old 05-28-2013, 06:06 PM   #717
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Question Tires

I just put 275/65/18 on my 2013 Rubicon unlimited without a lift .
Would they cause a problem ?
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Old 05-29-2013, 09:07 AM   #718
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I just put 275/65/18 on my 2013 Rubicon unlimited without a lift .
Would they cause a problem ?
275/65/18 (32x10.8) is very close to the stock size Rubicon tire, which is 255/75/17 (32x10).

The only difference is that you've gone up to an 18" wheel rather than the stock 17" wheel. Assuming it's an aftermarket wheel (and not one of the stock Sahara wheels), then you will surely have no problems. Even if it was a stock Sahara wheel, I'd be surprised if you had any problems.

So no, no problem.
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Old 05-29-2013, 02:04 PM   #719
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First off, hey everybody! I'm new here, but have been lurking around and reading for a while. This thread is incredibly useful, and you all are so knowledgeable. Thank you!

From reading through this thread, I have decided to go with Toyo AT2s. However, I am stuck between 285/70 and 265/70.

From the information in this thread, I've concluded that the 285s on a 17 inch aftermarket wheel with 4.25 inch backspacing could fit on my stock 2011 JK Sport with no problems. Is this correct? It is my daily driver, with some occasional light off-roading in sand. Also, could I fit 285/70s with a 5 inch backspaced wheel?

Additionally, I've concluded that a 265/70/17 could fit with 4.25 or 5 inch backspacing. Again, someone please correct me if I'm wrong.

Any information/opinions would be greatly appreciated! Thanks in advance!
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Old 05-29-2013, 07:15 PM   #720
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Join Date: Oct 2012
Location: Prairieville, LA
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Originally Posted by J Gand View Post
First off, hey everybody! I'm new here, but have been lurking around and reading for a while. This thread is incredibly useful, and you all are so knowledgeable. Thank you!

From reading through this thread, I have decided to go with Toyo AT2s. However, I am stuck between 285/70 and 265/70.

From the information in this thread, I've concluded that the 285s on a 17 inch aftermarket wheel with 4.25 inch backspacing could fit on my stock 2011 JK Sport with no problems. Is this correct? It is my daily driver, with some occasional light off-roading in sand. Also, could I fit 285/70s with a 5 inch backspaced wheel?

Additionally, I've concluded that a 265/70/17 could fit with 4.25 or 5 inch backspacing. Again, someone please correct me if I'm wrong.

Any information/opinions would be greatly appreciated! Thanks in advance!
I would go 285, 265 is pretty much stock size. 4.25" is a whole 2" more than stock (6.25") so you can fit both those sizes no problem. 285s will definitely rub offroading if you're disconnected at 5" backspacing. Most wheel spacers are 1.5" meaning (6.25-1.5) 4.75" of backspacing with stock wheels. If running that setup with 285s and have very slight rub when disconnected and I have about 2" lift. Hope that helps...

If you never go offroading, any of your combos will work.

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