35 x 12.5 on Mopar Lift JKU... Good idea? - Jeep Wrangler Forum
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Old 11-22-2017, 03:13 PM
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35 x 12.5 on Mopar Lift JKU... Good idea?

New here, bought a 2017 JKU Recon, last Jeep I had was about 25 years ago, so a lot has changed!

I want to run ATX AX195 18x9, 4.5 backspace, with BFG KM2 in the 35 x 12.5 x 18. I have 3.73, and know the impact this will have, I will mitigate that to a degree with the AEV recalibration. I live in lake effect snow MI, so I run dedicated snows on everything, have them already in stock size. Those will be on 5 months of the year, so I am going to try to avoid regearing, but we'll see. I come back to Jeeps from high performance sedans, so next to my 500hp sedan anything is going to feel anemic, and I have other toys for speed.

I guess my main question is clearance, having Mopar 2" Fox lift installed at dealer to maintain the warranty, other than that a Fox steering damper kit is my only planned mod for now. I have read till my eyes hurt trying to find out what others with that combo say about clearance, some say no problem, some say rub on fender, and I just want to find out if I should stick with stock or 33 instead, or if the 35 will be OK. The Mopar kit says 4.5" BS is ideal, so I'm going with that, and in case people wonder, going with 18 as I may go to a big brake kit down the road.

So does this newbie have it all wrong, or am I OK with above setup???

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Old 11-22-2017, 04:15 PM   #2
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FCA says you can run 35's with their 2" lift with proper BS. I am running 34's (295/70/18 on stock Sahara rims with a 1.5" wheel spacers) on her 15 JKUR with a TF leveling lit with a slight rub at the rear when she took the corner a little hard. I told her not to do that again... It hasn't been off road yet though.

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Old 11-22-2017, 04:49 PM
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Quote:
Originally Posted by terpsmandan View Post
FCA says you can run 35's with their 2" lift with proper BS.
Thanks, yes, this is what the manual for the lift says:

IMPORTANT TIRE / WHEEL and CLEARANCE DATA
Maximum tire width for use on factory wheels is 10.50". Factory Wrangler wheels are 17"
diameter x 7" wide with 6.25" backspacing.
Minimum aftermarket wheel diameter is 17".
For an 11.50" wide tire, use an 8" to 8.5" wide wheel with 3.25" to 4.75 backspacing. Ideal
backspacing is 4.5".
For a 12.50" wide tire, use an 8.5" to 9" wide wheel with 3.25" to 4.75" backspacing. Ideal
backspacing is 4.75". With 12.50" wide tires, expect some rear tire scrub at the plastic inner
fender liners during full travel / articulation while off-roading; this generates a slight sound, but
no damage.
Maximum tire diameter is 35". For adequate clearance of 35" tires during full travel /
articulation while off-roading, minor body trimming is required at the front / lower corner of the
rear fenderwell openings. The rear ends of factory Rubicon rock rails must also be trimmed;
both trimming steps are detailed in these Instructions.

So 18x9 with 4.53" backspacing would seem to fall close to their ideal, and with forest trails and sand dunes being my planned off road locations, I don't expect a lot of full articulation. But thanks for making me reread this, I now see the part I glanced over about rub and trimming, and it shows having to cut off a triangular section of the sheet metal fender corner, so maybe I rethink this and go to a 18x9 with the 4.5" backspacing and a LT285/70R18, it would look like those would not have clearance issues, and split the difference on increased height and width.
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Old 11-22-2017, 11:57 PM
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Looks like the manual I was looking at was for the old kit, not the new part number I have going on in 2 weeks. So the only text in the new manual says that the kit is designed for 33 to 35" tires with 12.5" width, so I am back to the 35x12x18 I guess. I'm going to see if I can find someone at Jeep that can give me some accurate info on whether the 35s rub or have other issues, require larger bump stops, etc.
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Old 11-24-2017, 09:57 AM   #5
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One thing with the 35's on the back is the pinch seam. With those 34's on hers there is about 1.5" clearance to the rock rails and the pinch seam that it behind it. There a couple of videos out there on trimming the pinch seam with an cut-off wheel. I am keeping both of mine to 34's because of that issue. 295-70-19 on hers and 285-75-17 on mine. BFG just released a KM2 in that size this month.
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Old 11-24-2017, 07:26 PM
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Originally Posted by terpsmandan View Post
One thing with the 35's on the back is the pinch seam. With those 34's on hers there is about 1.5" clearance to the rock rails and the pinch seam that it behind it. There a couple of videos out there on trimming the pinch seam with an cut-off wheel. I am keeping both of mine to 34's because of that issue. 295-70-19 on hers and 285-75-17 on mine. BFG just released a KM2 in that size this month.
I really appreciate your replies. Apparently the '17s have a 45 degree angle on the area that previously had to be cut, and the Recon has shorter rails to clear 35s, but it just seems like maybe I should stick with 33 to 34s and 11.5" width to minimize potential issues. Have it down to a 285/70R18, or a 285/70/17, both in a KM2. Leaning towards the 17 actually, and then just have to be careful if I go to a big brake kit.
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Old 11-25-2017, 09:37 AM   #7
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I am planning to go with the KM2 in a 285/75/17. They just introduced that size on November 1. I have a set of those in 275/70/17 now. Running a Q-tech leveling kit and not planning on any further upgrades.

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