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Old 04-09-2014, 03:10 PM   #1
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Wheel upgrades and modification questions!

Hey everyone,

Just purchased my first Jeep JKU not long ago and im looking at getting some bigger tires put on, so heres a few questions I have about doing so.

With stock suspension and diffs, what is the biggest tire size I can use with out tearing apart my driveline?

If I was to go with 35" tires preferably mounted on after market 17-18" rims, what lifts and other upgrades are necessary to occomidating these wheels?

For wider stance, should I use a wheel spacer kit or just a deeper rim offset?

Finally......

In the future I want to do a bigger lift on it and run 35-37" tires. Looking to do a 4"-6" lift with a long arm kit. What differentials should I run? Best tire/rim size combo? Any other recommended upgrades to go with the lifts?

Thanks for the help everybody!

First time WranglerForum guy...

JKUZETT

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Old 04-09-2014, 03:20 PM   #2
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Short answer for the short term is that you can run 35s without a lift as long as you don't do any heavy articulating. Largest tire on stock JK? Here's your answer!

As far as lifts go, 3" is pretty much the max you can/should go before you need to start modifying other things.

You can check out the tire & wheel area as well as the JK areas for more answers.

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Old 04-09-2014, 03:53 PM   #3
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to the Forum..[ATTACH]968730[/ATTACH

Attachment 968730

Attachment 968738

This may help you on your wheel Back Spacing, width, and offset!

With no lift and stock wheels, 285x70RZ17S are as big as you can go, without spacers, our wheels with more Backspacing. You may get a slight rub on full turns!

Your factory wheels have a 6.25 Backspacing, and if you decided to get different wheels, then 4.5 Backspacing will work really good, for either 33s, or 35s.......
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Old 04-09-2014, 04:02 PM   #4
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Quote:
Originally Posted by JKUZETT View Post
Hey everyone,

Just purchased my first Jeep JKU not long ago and im looking at getting some bigger tires put on, so heres a few questions I have about doing so.

With stock suspension and diffs, what is the biggest tire size I can use with out tearing apart my driveline?
Diffs? Are you asking just about the gear ratio in the diffs? With no lift and no new gear ratio, 33's is the biggest tire you can comfortably run. No tire will tear apart your diffs or suspension. It is all about clearance for the tires.

If I was to go with 35" tires preferably mounted on after market 17-18" rims, what lifts and other upgrades are necessary to occomidating these wheels?
First of all, I would suggest 17" wheels or smaller, because tires for 18's are very expensive. You can probably get a 16" set of wheels AND 35" tires for the cost of 35's for 18's alone. You can run 35's with 2.5" of lift and some "minor" trimming. Like to the pinch seam out back and Rubicon rock rails if you got them. You should also consider a gear ratio change to 4.56, 4.88 or 5.13 depending on the year of the Jeep, new motor or old motor. You'll probably want to also get an aftermarket tire carrier. a 35" wheel bouncing around on the tailgate everyday takes its toll.

For wider stance, should I use a wheel spacer kit or just a deeper rim offset?
Any aftermarket off road tire will give you a wider track. They will be about 12.5" wide. If you get the appropriate offset wheel, you will have a wider track than stock.

Finally......

In the future I want to do a bigger lift on it and run 35-37" tires. Looking to do a 4"-6" lift with a long arm kit. What differentials should I run? Best tire/rim size combo? Any other recommended upgrades to go with the lifts?
4" lift would be the max I would recommend when running 37's and with that you will need driveshafts. 6" is HUGE and can run 40-44" tires. Again is differentials just asking what gear ratio? with 37's you will want 4.88, 5.13 or 5.38 depending on year and transmission.

Thanks for the help everybody!

First time WranglerForum guy...

JKUZETT
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Old 04-09-2014, 08:48 PM   #5
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Thanks for the info everyone... Tons of new knowledge gained today!

I'll check in now and then with progress and other question...

Appreciate it very much
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