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Old 12-01-2019, 09:46 PM
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Tire Size

What is the largest tire size a full stock 07 JK can handle ? Can I switch to 17" wheels ?

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Old 12-02-2019, 12:35 AM   #2
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I take it you have a X with 16" wheels.

Yes, you can mount 17" or 18" wheels as long as they have the correct lug spacing. In the case of the 17" wheels found on the Sport S or Rubicons in recent years or the 18" wheels found on the Sahara. All of the JKs have 5 on 5" lug spacing.

The largest tire mounted on a JK/JKU from the factory were the 255/75R17 or in the case of the Sahara 255/70R18 tires. Both are 32" tires.

You can go up a bit in size without a lift. Many like to go up a bit to LT285/70R17 tires which are 32.8" tall. If you use the stock take off wheels, with that 32.8" tire you may encounter some rubbing at full lock in tight turns.

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Old 12-02-2019, 09:54 AM   #3
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Quote:
Originally Posted by Howellguy View Post
What is the largest tire size a full stock 07 JK can handle ? Can I switch to 17" wheels ?
As mentioned, you can easily switch to 17 inch wheels.
And the new 17 wheels can have less backspacing which would allow a wider tire if desired.
You may even find some take offs from a JL / JT that are for sale cheap. Any 17" JK / JKU wheel would also fit and those can often be found cheap as well.
Here is a great thread on the subject.
https://www.wranglerforum.com/f27/la...er-142837.html
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Old 12-02-2019, 06:10 PM   #4
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Originally Posted by GuzziMoto View Post
You may even find some take offs from a JL / JT that are for sale cheap. Any 17" JK / JKU wheel would also fit and those can often be found cheap as well.
Here is a great thread on the subject.
https://www.wranglerforum.com/f27/la...er-142837.html
This is true. However be careful if you plan to add a lift - When I first got my JKUR it had a 2.5" Rock Krawler lift but the PO had pulled off his 35's and aftermarket wheels before trading it in. So when I bought it there were stock 17" Rubicon wheels and tires.

For $1,000 I bought 5 brand new 17" JL Rubicon wheels with 33" tires (285's) and loved the look. HOWEVER, on my first off-road excursion, I blew both front tires and scraped up the insides of the rear wheels on the sway bar extensions (from the lift) because they made contact with the tire sidewalls on the front and with the insides of the wheels on the rear. I didn't realize at the time that most lifts require less than 5" of backspace and the stock JLR wheels are like 6.2"

After that I went to aftermarket wheels with less backspacing (5.1") and no more blown tires. But it was an expensive lesson - two BRAND NEW 33" BFG KO2 tires...

Front:



Rear:

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Old 12-02-2019, 08:01 PM   #5
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You can run a lift with the stock wheels. We did for a year. But you do always need to cycle the suspension after installing ANY lift to make sure that there is no contact between parts (including tires, clearly).
Sorry about @sbsyncro 's bad luck. There is a lesson there, though. Always check that the suspension can cycle and turn without contact. Sometimes you need to change the way things are installed to maintain clearance. Whether it is what type of sway bar link, what side of the sway bar a link is on, or even which way a bolt is run that holds the sway bar link on, there are usually solutions to any clearance problem as long as it is identified BEFORE the issue blows up.
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Old 12-02-2019, 09:07 PM   #6
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Sometimes you need to change the way things are installed to maintain clearance. Whether it is what type of sway bar link, what side of the sway bar a link is on, or even which way a bolt is run that holds the sway bar link on, there are usually solutions to any clearance problem as long as it is identified BEFORE the issue blows up.
This is so true. I came from owning CJs straight to the JK. With a CJ back in the day, anything worked (it seemed) and there wasn't the sheer number of options we have today with the JK.

I ended up flipping the bolts on the sway bar links (they were installed per RK's instructions by the PO) and that helped, but the real solution was getting another inch of backspace with new wheels. Next set of tires I need, I'm hoping for some good 35x10.5 pizza cutters ftw.
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Old 12-02-2019, 09:21 PM   #7
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Lucky for you, there is a lot of prior knowledge within this forum.
Here is a thread 7 1/2 years in the making, probably answering any questions you may have about tires:
https://www.wranglerforum.com/f27/la...er-142837.html
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Old 12-03-2019, 12:08 PM   #8
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Whoever installed sbsyncro's lift, installed the upper bolts on the swaybar links backwards. Notice in his photos the end of the bolt with the nut is facing outward toward the tire. The stock installation has the end of the bolts facing inward. In addition the factory bolts have a rounded head like a carriage bolt. Here are the photos from my '17 Chief which has the factory setup:


Front:


Rear:
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Old 12-03-2019, 04:33 PM   #9
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Whoever installed sbsyncro's lift, installed the upper bolts on the swaybar links backwards. Notice in his photos the end of the bolt with the nut is facing outward toward the tire. The stock installation has the end of the bolts facing inward. In addition the factory bolts have a rounded head like a carriage bolt. Here are the photos from my '17 Chief which has the factory setup:


Front:


Rear:


You're right - after the issue I checked the install instructions which were inconclusive then I called RK. Turns out the PO installed them backwards, but the guy I talked to at RK didn't seem to think it mattered either way. I guess it why RK specs wheels with no more than 4.5” of backspace - just to make it 'idiot proof'. The more time I spend with this RK lift the less impressed i am with it frankly.


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Old 12-03-2019, 07:01 PM   #10
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Originally Posted by Howellguy View Post
What is the largest tire size a full stock 07 JK can handle ? Can I switch to 17" wheels ?
I think 255/80/17 is a perfect size for a stock JK.
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Old 12-04-2019, 08:41 AM   #11
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With very limited sources. Goodyear has nothing in that size and BFG has one tire, a KM3 for $277 each. I guess they are higher since they are an uncommon size.

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